It is necessary that he ______ us.A、helpB、helpsC、helpedD、would helpA和54题一样，I

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问题 It is necessary that he ______ us.

选项 A、help
B、helps
C、helped
D、would help

答案 A

解析和54题一样，It is necessary后从句中动词用虚拟语气，即动词原形。

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