单项选择题

John has got a full mark in the test. He ______ very hard all these days.

A．will work
B．may work
C．must have worked
D．could have worked
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—Have you been ______ any of your friends from college—No, I have been out of touch with them for several years.
A．in contact with
B．satisfied with
C．touch with
D．connect with
单项选择题
This terrible accident happened ______ the cold evening of June 6, 1987.
A．in
B．to
C．at
D．on
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