Hurry up! Once the concert starts, nobody _______ to enter the concert hall.

A．a(chǎn)llows B．a(chǎn)llowed
C．is allowed D．is allowing

C

解析試題分析：句意：快點(diǎn)！一旦音樂會(huì)開始了，沒有人被允許進(jìn)入音樂廳。這里是allow sb. to do sth. 允許某人做某事的被動(dòng)語(yǔ)態(tài)形式：be allowed to do；其它都是值得主動(dòng)語(yǔ)態(tài)，故選C。
考點(diǎn): 考查動(dòng)詞被動(dòng)語(yǔ)態(tài)的用法。

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