【題目】You must __ ____ careful when you go across the street

You're right

A. areB. isC. amD. be

【答案】D

【解析】

句意:——當(dāng)你穿過(guò)街道時(shí),一定要小心.﹣﹣你是對(duì)的.考查be動(dòng)詞.A復(fù)數(shù).B單數(shù).C通常與I連用.D原形.根據(jù)情態(tài)動(dòng)詞must后用原形be是.故選:D

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