【題目】Don’t come into the lab ________ you are asked to.

A. unless B. until C. because D. since

【答案】A

【解析】

試題分析：句意：不要進(jìn)入實(shí)驗(yàn)室除非你被叫進(jìn)去。A除非；B直到；C因?yàn)?/span>；D既然。此題考查連詞，根據(jù)句意，故選A。

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