—Whoissinginginthenextroom? —It
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問題詳情:
—Who is singing in the next room?
— It _______ be Lucy. She likes singing at this time.
A. can B. must C. mustn’t D. should
【回答】
B must be“一定是”,表示推測。
知識點:情態動詞
題型:選擇題
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