【題目】You are not allowed to attend the concert _______ you have a ticket for it.

A. ifB. becauseC. sinceD. unless

【答案】D

【解析】

句意：除非你有票否則不允許你參加音樂會。if如果，引導(dǎo)條件狀語從句；because 因為，引導(dǎo)原因狀語從句；since自從，引導(dǎo)時間狀語從句；既然，引導(dǎo)原因狀語從句；unless除非，如果不。根據(jù)句意可知，這里應(yīng)表示否定的意思，故應(yīng)選D。

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