____ the 1990s, the number of antelopes had fallen to about 50,000.
A．DuringB．SinceC．ByD．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(xiàng)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(xiàng)正確。
點(diǎn)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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