It is certain that he will do all he can ______ us.

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问题 It is certain that he will do all he can ______ us.

选项 A、help
B、helping
C、to help

答案C

解析此句考查动词不定式。本句中，that引导的从句宾语为all，其后he can是定语从句，这里 to help us做目的状语。

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