单项选择题

The professor, ______ as a splendid speaker, was warmly received by the students.

A．known
B．knowing
C．to be known
D．having known
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单项选择题
There is no evidence ______ oil price will come down in the near future.
A．which
B．that
C．where
D．as
单项选择题
It is most desirable that he ______ for the information by himself with a few clicks online．
A．search
B．searched
C．has searched
D．will search
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