题目内容

4.1        the paper when I found another mistake and then corrected it carefully. (about)

我正要上交试卷的时候,突然发现了另一处错误并将它仔细更正过来了。

4. was about to hand in考査be about to do... when... 的用法。"正要做……时,突然发生了……"用be about to do sth. when.

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