题目

He was always the last to leave in order to clean up the workroom and        ________ the tools.     A.put away     B.take away    C.push aside   D.look after   答案:A  考查词组辨析。put away“把……收好,放好”。   已知数列{an},a1=1,an+1=an+1则an=________;
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