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【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:——當你穿過街道時,一定要小心.﹣﹣你是對的.考查be動詞.A復數.B單數.C通常與I連用.D原形.根據情態(tài)動詞must后用原形be是.故選:D

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