问题
选择题
—Whose exam paper is it?
—It ______ be Li Lei's. He always forgets to write his name on it. [ ]
A. can
B. must
C. mustn't
D. can't
答案
答案：B
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—Whose exam paper is it?
—It ______ be Li Lei's. He always forgets to write his name on it. [ ]
A. can
B. must
C. mustn't
D. can't
答案：B