【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(dòng)物管理員變得很焦急，因?yàn)橛慰腿藬?shù)正變得越來(lái)越少。the number of+名詞作主語(yǔ)，后面的謂語(yǔ)動(dòng)詞要用單數(shù)，A，B三項(xiàng)的主語(yǔ)都得是復(fù)數(shù)；數(shù)字的變化和管理員的焦急是同時(shí)進(jìn)行的，所以要用現(xiàn)在進(jìn)行時(shí)．故選C。

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