单项选择题

Susan, you are so lazy. This job ______ hours ago.

A．should have finished
B．could have finished
C．ought to have been finished
D．must have finished
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单项选择题
Two TV cameras ______ eyes of a mechanical man.
A．are served as
B．serve as
C．will be serve as
D．were serve as
单项选择题
Mary ______ a diary.
A．carries on
B．follows
C．puts down
D．keeps
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