题目内容

为什么打印机产生滑座错误、甚至打印头撞头的现象？

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It was not until she had finished all her work_____.

A. did she return
B. that she returned
C. when she returned
D. that did she return

He‘s working hard_____.

A. for fear that he will fail
B. for fear he should fail
C. lest he fails
D. for case he would fail

Your bike needs_____.You ‘d better do i right now.

A. clean
B. to be clean
C. being cleaned
D. to clean

车站如何进行车票盘点工作？