Question

---- May we leave the classroom now?
---- No, you _____. You _____ to leave until the bell rings.

A．mustn’t, are allowed	B．can’t, aren’t supposed
C．don’t have to, are supposed	D．needn’t, aren’t allowed

Answer 1

B

考查情景交際和情態(tài)動(dòng)詞�！拔覀儸F(xiàn)在可以離開(kāi)教室了嗎？”“不，你們不可以。你們不能離開(kāi)，在鈴聲響起之前�！眂an’t表示允許，“不可以”；needn’t“不必”；be supposed to do sth.“應(yīng)該做某事”。故選B。