问题
选择题
If you really have to leave during the meeting, you’d better leave ____ the back door.
A．for
B．by
C．across
D．out
答案
答案：B
考查介词。for为了；by借助，通过；across通过（平面）；out出去。根据句意：如果你必须在会议期间离开，你最好从后门出去。
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