【題目】I guess there must be someone outside the house. Let’s stop to listen.

A、speak B、speaking C、spoke

【答案】B

【解析】試題分析：句意：我猜一定有人正在房子外面講話。讓我們停下來去聽聽。A、speak 講話，動(dòng)詞原形；B、speaking 講話，現(xiàn)在分詞；C、spoke講話，過去式。must be，表示猜測(cè)。there be someone／something doing 有人／物正在做某事。故選B。

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