16. I ______ all the cooking for my family, but recently I’ve been too busy to do it.

A. will do                                     B. do

C. am doing                                  D. had done

【分析】B。此处用一般现在时表示一种经常性的行为，虽然目前并没有这样做。

17. Barbara is easy to recognize as she’s the only one of the women who ______ evening dress.

A. wear                                       B. wears 

C. has worm                                D. have worm

【分析】B。由于one of the women前有only修饰，说明其后的定语从句是修饰one的，而不是修饰women的，所以定语从句中的谓语动词要用单数，故可排除A和D；再根据句意，此处谈的是一般情况，故要用一般现在时，即选B(www.yygrammar.com)。

18. Every few years, the coal workers ______ their lungs X-rayed to ensure their health.

A. are having                                  B. have  

C. have had                                     D. had had

【分析】B。根据句中的every few years（每隔几年）可知，动作带有经常性和规律性，故用一般现在时。又如：The Summer Olympic Games take place every four years. 奥林匹克夏季运动会每四年举行一次。

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