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(guò)去的16年里，亞米希人的人口數(shù)將近增加了一倍達(dá)到了23萬(wàn)，每個(gè)家庭大約有5個(gè)孩子．

解答 答案：B
根據(jù)句中的時(shí)間狀語(yǔ)"Over the past 16years"可知，此處表示在過(guò)去的16年里發(fā)生的事情，即人口數(shù)將近增加了一倍；故應(yīng)使用現(xiàn)在完成時(shí)；A．過(guò)去完成時(shí)表示發(fā)生在過(guò)去某時(shí)間之前的動(dòng)作；C．一般過(guò)去時(shí)，表示過(guò)去發(fā)生并且現(xiàn)在已經(jīng)結(jié)束的動(dòng)作，此處指的是人口數(shù)的增長(zhǎng)情況，因此應(yīng)表示現(xiàn)在沒(méi)有結(jié)束的動(dòng)作；D．現(xiàn)在完成時(shí)態(tài)的被動(dòng)語(yǔ)態(tài)；此處的主語(yǔ)the population 與謂語(yǔ)double構(gòu)成主謂關(guān)系，不能使用被動(dòng)語(yǔ)態(tài)；因此A．C．D都不合句意；故選B

點(diǎn)評(píng) 本題考查了現(xiàn)在完成時(shí)的用法．做本題時(shí)，首先可以根據(jù)句中的時(shí)間狀語(yǔ)，判斷出本句應(yīng)使用的時(shí)態(tài)；其次應(yīng)熟練掌握各時(shí)態(tài)所表示的意義以及它們之間的用法區(qū)別．

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