问题
If you really have to leave during the meeting, you’d better leave _____ the back door[ ]
A: for
B: by
C: across
D: out
B: by
C: across
D: out
正确答案是：
同类题型
You _____ such a serious mistake ifyou had followed his advice
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Remember _________ the second _________ on your right! — OK, thanks a lot!