单项选择题

This machine, ______ for many years, is still working perfectly.

A. after which I have looked
B. which I have looked after
C. that I have looked after
D. I have looked after
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单项选择题
The policeman came up to see ______.
A. what the matter is
B. what the matter was
C. what was the matter
D. what is the matter
单项选择题
John got beaten in the game, ______ had been expected.
A．as
B．that
C．what
D．who
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