【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(huì)。if如果,引導(dǎo)條件狀語從句;because 因?yàn)椋龑?dǎo)原因狀語從句;since自從,引導(dǎo)時(shí)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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