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---Mayweleavetheclassroomnow?---No,you___.You____toleaveuntilthebellrings.Amustn't,ar...
---May we leave the classroom now?
---No,you___.You____to leave until the bell rings.
A mustn't , are allowed
B don't , are supposed
C needn't , aren't allowed
D can't , aren't supposed 答案是A,为什么? 展开
---No,you___.You____to leave until the bell rings.
A mustn't , are allowed
B don't , are supposed
C needn't , aren't allowed
D can't , aren't supposed 答案是A,为什么? 展开
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