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He is very old, ______ he still works very hard.
A.butB.ifC.whenD.as
A

试题分析:考查连词:A. but 但是,B. if 如果,C. when当…时候,D. as正如,因为,随着,句意:他老了,但是还是工作很努力。两句话是转折关系,选A。
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