单项选择题

You (had better) (return to) your dormitory and (to enjoy) the company of your room-mates instead of (wasting) time with me.

A．had better
B．return to
C．to enjoy
D．wasting
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单项选择题
Bats (are able) (to guide them) by producing sound waves (too high) for us (to hear).
A．are able
B．to guide them
C．too high
D．to hear
单项选择题
I was just (falling) (sleep) last night (when) I heard a knock (at) the door.
A．falling
B．sleep
C．when
D．at
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