问题
选择题
—May we leave the classroom now?
—No, you . You to leave until the bell rings. [ ]
A. must; are allowed
B. can't; aren't supposed
C. needn't; aren't allowed
答案
答案：B
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—May we leave the classroom now?
—No, you . You to leave until the bell rings. [ ]
A. must; are allowed
B. can't; aren't supposed
C. needn't; aren't allowed
答案：B