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    精英家教网 > 高中英语 > 题目详情
    ____ the 1990s, the number of antelopes had fallen to about 50,000.
    A．DuringB．SinceC．ByD．Over
    C

    试题分析：考查时态与介词的连用。本题的根据是后面句中的时态had fallen，在四个选项中只有by可以和完成时连用，by到…时为止；与完成时连用，如果后面是现在的时间，就使用现在完成时，如果后面是过去的时间，就使用过去完成时，如果后面是将来的时间，就使用将来完成时。句意：到20世纪90年代，羚羊的数量下降到5万只。故C项正确。
    点评：介词by到…时为止；与完成时连用，如果后面是现在的时间，就使用现在完成时，如果后面是过去的时间，就使用过去完成时，如果后面是将来的时间，就使用将来完成时。
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