题目内容
【题目】Practicing conversations ________ able to help you improve your speaking skills.
A. can B. are C. is D. will
【答案】C
【解析】句意：练习对话能帮助你提高你的口语技能。此处动名词短语Practicing conversations作主语。看成是一个整体，谓语用单数，be able to能，故此处用is able to。故选C。
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