He found it necessary for us______from each other.A、to help and learnB、helping

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问题 He found it necessary for us______from each other.

选项 A、to help and learn
B、helping and learning
C、to learn and to help
D、learning and helping

答案 A

解析本题考查it作形式宾语用法。it为found的形式宾语，而后面的不定式to help and learn from each other为found的真正宾语。

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