问题补充:
is necessary for us to tell him about the result.
A. That
B. This
C. It
D. What
答案:
A. That
B. This
(答案→)C. It
D. What
解析:考查it用法。本题的It是形式主语,真正的主语是后面的不定式to tell him about the result.句意:对我们来说,告诉他结果是必要的。故C正确。
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