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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(xiàn)在時(shí)表示一種經(jīng)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(dòng)詞要用單數(shù)，故可排除A和D；再根據(jù)句意，此處談的是一般情況，故要用一般現(xiàn)在時(shí)，即選B(www.52ysedu.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(jù)句中的every few years（每隔幾年）可知，動(dòng)作帶有經(jīng)常性和規(guī)律性，故用一般現(xiàn)在時(shí)。又如：The Summer Olympic Games take place every four years. 奧林匹克夏季運(yùn)動(dòng)會(huì)每四年舉行一次。

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