问题
选择题
—Oil is everywhere in this store, so you _______ know smoking is forbidden here.
—I'm sorry. [ ]
A. can
B. may
C. must
答案
答案：C
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—Oil is everywhere in this store, so you _______ know smoking is forbidden here.
—I'm sorry. [ ]
A. can
B. may
C. must
答案：C