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The zoo keepers is worried because the number of visitors  __       smaller
and smaller.
A．becomeB．becameC．is becomingD．have become
C
考查主謂一致。the number of……的數(shù)目，謂語(yǔ)動(dòng)詞用單數(shù)形式。根據(jù)句意用現(xiàn)在進(jìn)行時(shí)。句意：動(dòng)物管理員擔(dān)心游客的數(shù)量正在變得越來(lái)越少。
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