【題目】The directors have a meeting every Friday ______ there is nothing to discuss.

A. unless B. because

C. when D. if

【答案】A

【解析】

試題分析：句意：董事會每周五開會，除非無事討論。A. unless 除非，如果不；B. because因為；C. when 當(dāng)……時候；D. if如果。根據(jù)句意可知，答案為A。

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