题目列表(包括答案和解析)
--Who is singing in the next room?
-- must be Marie.
A.It B.She C.This D.There
--Who is singing in the next room?
--________ must be Marie.
—Who is singing in the next room?
— It _____ be Lucy. She has gone to Hong Kong.
A. can’t B. must C. may not D. needn’t
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