--- May we leave the classroom now ---- No,you can't.You ___

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--- May we leave the classroom now ---- No,you can't.You ____ to leave until the bell rings.
A.are allowed B.are supposed C.aren't allowed D.aren't supposed
选什么呀 C和D有什么区别

选D,不是选C
be supposed to是应该的意思.
这句话的意思是在铃响前你们是不应该走的.
它表示的是某人应该做什么,不应该做什么.相当于should.
allow意思是允许,表示的是强制性的.有统治的意味.而什么时候该离开教室并非是统治的强制性,而应该是原则的约束性.所以应该选D.

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