问题描述：
Quite a number of people think ______ necessary to learn Chinese history.A.it B.that is C.this i
Quite a number of people think ______ necessary to learn Chinese history.
A.it B.that is C.this is D.that
Quite a number of people think ______ necessary to learn Chinese history.
A.it B.that is C.this is D.that
问题解答：
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