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。此處用一般現在時表示一種經常性的行為，雖然目前并沒有這樣做。

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修飾，說明其后的定語從句是修飾one的，而不是修飾women的，所以定語從句中的謂語動詞要用單數，故可排除A和D；再根據句意，此處談的是一般情況，故要用一般現在時，即選B(www.hz123456.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。根據句中的every few years（每隔幾年）可知，動作帶有經常性和規律性，故用一般現在時。又如：The Summer Olympic Games take place every four years. 奧林匹克夏季運動會每四年舉行一次。

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