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> ____ the 1990s, the number of antelopes had fallen to about 50,000.A.DuringB.SinceC.ByD.Over-高二英语
____ the 1990s, the number of antelopes had fallen to about 50,000.A.DuringB.SinceC.ByD.Over-高二英语
题目简介
____ the 1990s, the number of antelopes had fallen to about 50,000.A.DuringB.SinceC.ByD.Over-高二英语
题目详情
____ the 1990s, the number of antelopes had fallen to about 50,000.
A.During
B.Since
C.By
D.Over
题型:单选题
难度:中档
来源:不详
答案
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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题目简介
____ the 1990s, the number of antelopes had fallen to about 50,000.A.DuringB.SinceC.ByD.Over-高二英语
题目详情
答案
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。