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

A．helpB．helps
C．to helpD．helping

C

解析試題分析：句意：幫助老人橫穿公路是好的。這是固定句型，其中it作的是形式主語(yǔ)，后面要用不定式做真正主語(yǔ)，所以選C。
考點(diǎn)：考查固定句型

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