____ the 1990s, the number of antelopes had fallen to about 50,000.


  1. A.
    During
  2. B.
    Since
  3. C.
    By
  4. D.
    Over
C
試題分析:考查時態(tài)與介詞的連用。本題的根據(jù)是后面句中的時態(tài)had fallen,在四個選項中只有by可以和完成時連用,by到…時為止;與完成時連用,如果后面是現(xiàn)在的時間,就使用現(xiàn)在完成時,如果后面是過去的時間,就使用過去完成時,如果后面是將來的時間,就使用將來完成時。句意:到20世紀(jì)90年代,羚羊的數(shù)量下降到5萬只。故C項正確。
考點:考查時態(tài)和介詞的連用
點評:介詞by到…時為止;與完成時連用,如果后面是現(xiàn)在的時間,就使用現(xiàn)在完成時,如果后面是過去的時間,就使用過去完成時,如果后面是將來的時間,就使用將來完成時。
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