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，謂語動詞用單數(shù)形式。根據(jù)句意用現(xiàn)在進行時。句意：動物管理員擔心游客的數(shù)量正在變得越來越少。
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