—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(shí)間；...not...until是“直到...才”表示直到某一時(shí)間,某一行為才發(fā)生,而在之前該行為并沒(méi)有發(fā)生.如: I studied English until 9 o’clock last night. 我咋晚學(xué)英語(yǔ)一直學(xué)到9點(diǎn)鐘(表示9點(diǎn)前一直在學(xué)) 。I did not study Englis until 9 o’clock last night. 我咋晚直到9點(diǎn)鐘才學(xué)英語(yǔ)(表示9點(diǎn)才開(kāi)始學(xué))；needn’t:不必；can’t:不能。根據(jù)句意，應(yīng)是“你不能離開(kāi)，直到鈴響才能離開(kāi)”故選D。
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