He is nervous because he doesn't know the computer. A.how working on B.how works at C.how to work on D.how to work with 题目和参考答案——青夏教育精英家教网—

题目内容

He is nervous because he doesn't know ______ the computer.

　　A.how working on　　 B.how works at

　　C.how to work on D.how to work with

答案：C

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