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！一旦音樂會開始了，沒有人被允許進入音樂廳。這里是allow sb. to do sth. 允許某人做某事的被動語態(tài)形式：be allowed to do；其它都是值得主動語態(tài)，故選C。
考點: 考查動詞被動語態(tài)的用法。

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