______known to us,_______ increasing number of students are buried in their studies.
A.What is;a
B.It is;the
C.As it is;the
D.As is;an
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D解析本题考查定语从句和冠词。“，”前后都是句子，可判断第一个空应用连词，排除B项； a number of +复数名词+复数谓语动词；而the number of +复数名词+单数谓语动词；再结合are及increasing可知第二个空应填an。句意：众所周知，专心学习的孩子越来越多。