—May we leave classroom now?
—No, you        . You        to leave until the bell rings.
A．mustn’t, are allowedB．don’t have to, are supposed
C．needn’t, aren’t allowedD．can’t, aren’t supposed
D
...until...是“直到”的意思,表示某一種行為一直持續(xù)到某一時間；...not...until是“直到...才”表示直到某一時間,某一行為才發(fā)生,而在之前該行為并沒有發(fā)生.如: I studied English until 9 o’clock last night. 我咋晚學(xué)英語一直學(xué)到9點鐘(表示9點前一直在學(xué)) 。I did not study Englis until 9 o’clock last night. 我咋晚直到9點鐘才學(xué)英語(表示9點才開始學(xué))；needn’t:不必；can’t:不能。根據(jù)句意，應(yīng)是“你不能離開，直到鈴響才能離開”故選D。
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