21. ________ the man grew older, he lost interest in everything except gardening.

A. With                   B. Since                      C. While                     D. As

22. ________ you understand this rule, you’ll have no further difficulty.

A. Once                  B. Unless                     C. As                        D. Until

23. I had no sooner got back to the kitchen ________ the door-bell rang loud enough to wake the dead.

A. when                  B. than                        C. as                        D. while

24. I criticized him, you know, not ________ I hate him but ________ I love him.

A. because; because B. because; for             C. for; because         D. for; for

25. ________ he studies hard, he will never pass the examination.

A. If                        B. Unless                    C. Even if                 D. Even though

26. She worked hard ________ everything would be ready by the time he came back.

A. since                   B. so that                    C. as if                     D. unless

27. He waited ________ the volcano became quiet and he was able to return two days later.

A. when                   B. before                    C. as                        D. until

28. — May I go and play football with Dick this afternoon, Dad?

— No, you can’t go out ________ your work is being done.

A. before                  B. until                       C. as                        D. after

29. A warning news report from Qatar announces that a group of Islam will continue to kill Americans wherever they are ________ they leave the Arab world forever.

A. even though          B. in case                   C. whenever             D. until

30. I was so familiar with her that I recognized her voice ________ I picked up the phone.

A. the moment           B. after                      C. before                  D. while

【答案解析】

1. D. 考查“祈使句/名词+and+陈述句”句型。句意为：“再努力点，你就会成功的”。

2. B. so(因此)是并列连词，引出一个表示结果的分句，前面应是一个表示原因的分句，而无需再用连词，排除A；C和D又不是句子，也错了。

3. D. 因为rather than是对称连词，意为“而不” (from www.yygrammar.com)。

4. A. 因为but是并列连词，后面是个句子，前面也一定是个句子，而不是一个分词短语或不定式短语，更不能再用连词though，所以排除B、C和D。

5. C. 考查“祈使句+and+陈述句”句型，意为“如果…就…”。虽然or也可用于此句型，但or是“否则、要不然”之意，如：Work hard, or you’ll fail. (努力学习，否则就会不及格。)

6. D. 因为not only…but (also)…是固定搭配(from www.yygrammar.com)。

7. D. 因为句中的并列连词for表示原因，是对前面分句所述内容的解释或补充说明。

8. A. 因为句中的并列连词while表示“对比或相反”。

9. B. 因为句中的并列连词when = just at that time, 意为“这时(突然)”。

10. D. 因为只有or才能表示选择，意为“(是…) 还是”。

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