单项选择题

I have heard both teachers and students ______ well of him.

A．to speak
B．spoken
C．to have spoken
D．speak
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单项选择题
It is important that the hotel receptionist ______ that guests are registered correctly.
A．has made sure
B．made sure
C．must make sure
D．make sure
单项选择题
I didn't know the word. I had to ______ a dictionary.
A．look out
B．make out
C．refer to
D．go over
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