Question

If you really have to leave during class, you’d better leave____ the back door.

A．for

B．at

C．by

D．out

Answer 1

C

试题分析：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。选C。