【題目】Don’t turn off the computer before closing all the programs, _____ you’ll have problems.

A. but B. and C. so D. or

【答案】D

【解析】

試題分析：考查連詞。A. but 但是；B. and并且；C. so 因此；D. or 否則；句意：在關閉所有程序之前不要關電腦否則會出現(xiàn)問題。考查祈使句+or/and+ 陳述句，根據(jù)句意選or;

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