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It’s good _____ old people to cross the road.

A.helpB.helps
C.to helpD.helping

C

解析试题分析:句意:帮助老人横穿公路是好的。这是固定句型,其中it作的是形式主语,后面要用不定式做真正主语,所以选C。
考点:考查固定句型

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