【題目】Don't call me at the office ________ it is necessary.
A.before
B.unless
C.although
D.till

【答案】B
【解析】考查連詞。句意:請不要打電話到我的辦公室,除非是真的有必要。A. before在……以前;B.unless除非,引導條件狀語從句;C. although盡管;D. till直到……為止。故選B。

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