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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单项选择题
He is used to flying by air and on no occasion ______ frightened.
A．he has ever felt
B．he ever feels
C．ever does he feel
D．has he ever felt
单项选择题
______ you have any questions or needs, please contact the manager after 5: 00 p. m. on weekdays.
A．Because
B．Where
C．If
D．Though
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