Is that helpful ________ us?
A．forB．withC．toD．in
C

試題分析：句意:那對(duì)我們有幫助嗎？be helpful to sb. 是一個(gè)固定短語(yǔ)，對(duì)某人有幫助。這個(gè)短語(yǔ)中應(yīng)該用介詞to。for 為了，因?yàn)�；with 和…一起；in 在…里面。故選C。
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