【題目】The zoo keeper is worried because the number of visitors _______ smaller and smaller.
A.become
B.are becoming
C.is becoming
D.have became

【答案】C
【解析】句意:動物管理員變得很焦急,因為游客人數(shù)正變得越來越少。the number of+名詞作主語,后面的謂語動詞要用單數(shù),A,B三項的主語都得是復(fù)數(shù);數(shù)字的變化和管理員的焦急是同時進(jìn)行的,所以要用現(xiàn)在進(jìn)行時.故選C。

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