______known to us,_______ increasing number of students are buried in their studies.
A．What is;aB．It is;theC．As it is;theD．As is;an
D
本題考查定語從句和冠詞。“，”前后都是句子，可判斷第一個空應(yīng)用連詞，排除B項(xiàng)； a number of +復(fù)數(shù)名詞+復(fù)數(shù)謂語動詞；而the number of +復(fù)數(shù)名詞+單數(shù)謂語動詞；再結(jié)合are及increasing可知第二個空應(yīng)填an。句意：眾所周知，專心學(xué)習(xí)的孩子越來越多。
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