Last Monday, I was chatting online _____, before I knew it, our manager came in

题干

Last Monday, I was chatting online _____, before I knew it, our manager came in and stood
behind me.

A．until

B．when

C．as

D．so

上一题下一题 0.4难度单项选择更新时间:2016-06-27 04:31:23

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