number of visitors came but I don’t know     number.
A.A ; theB.The ; aC.A ; aD.The ; the
A
考查冠詞。a number of,許多,大量;the number,數(shù)目,數(shù)量。句意:許多參觀者到來了,但是我不知道數(shù)目。所以選A。
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