单项选择题

He ______with Smith at least four times in the past three years.

A．has been seen to meet
B．was seen to meet
C．had been seen meeting
D．is seen meeting
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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
People do not always recall events as they______ actually.
A．are happening
B．will happen
C．would happen
D．happened
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