All tickets must be purchased in advance, and you will not______to board the tra

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问题 All tickets must be purchased in advance, and you will not______to board the train without an actual paper ticket.

选项 A、allowing
B、allowed
C、be allowing
D、be allowed

答案 D

解析因为助动词will后面要接动词原形，所以(A)和(B)都不能成为答案。应该用被动语态，所以(C)也不是答案。正确答案是(D)。像be allowed to do sth．这样的句子最好能背下来。

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