问题
选择题
—Whose schoolbag is this?
—It _______ be Mary's. It has her name on it. [ ]
A. can
B. may
C. will
D. must
答案
答案：D
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—Whose schoolbag is this?
—It _______ be Mary's. It has her name on it. [ ]
A. can
B. may
C. will
D. must
答案：D