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7．Over the past 16years，the population of the Amish people           to 230，000，with roughly 5children per family．（　�。�
A．had nearly doubledB．has nearly doubled
C．nearly doubledD．has nearly been doubling

分析 在過去的16年里，亞米希人的人口數將近增加了一倍達到了23萬，每個家庭大約有5個孩子．

解答 答案：B
根據句中的時間狀語"Over the past 16years"可知，此處表示在過去的16年里發(fā)生的事情，即人口數將近增加了一倍；故應使用現(xiàn)在完成時；A．過去完成時表示發(fā)生在過去某時間之前的動作；C．一般過去時，表示過去發(fā)生并且現(xiàn)在已經結束的動作，此處指的是人口數的增長情況，因此應表示現(xiàn)在沒有結束的動作；D．現(xiàn)在完成時態(tài)的被動語態(tài)；此處的主語the population 與謂語double構成主謂關系，不能使用被動語態(tài)；因此A．C．D都不合句意；故選B

點評 本題考查了現(xiàn)在完成時的用法．做本題時，首先可以根據句中的時間狀語，判斷出本句應使用的時態(tài)；其次應熟練掌握各時態(tài)所表示的意義以及它們之間的用法區(qū)別．

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