问题描述：
1:we _________his uncle's yesterday.
A:called on B:arrived to C:reached at D:called at
2:Quite a number of people think ______ necessary to learn Chinese history.
A.it B.that is C.this
都选哪个?为什么呢?
A:called on B:arrived to C:reached at D:called at
2:Quite a number of people think ______ necessary to learn Chinese history.
A.it B.that is C.this
都选哪个?为什么呢?
问题解答：
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