单项选择题

I wish ______ you the answer to your problems.

A．I can give
B．I could give
C．I give
D．I am giving
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单项选择题
Scientists ______that bacteria through microscopes for many years．
A．studied
B．have studied
C．had studied
D．have seen studied
单项选择题
It is necessary for technicians ______ one or two foreign languages．
A．master
B．to master
C．mastering
D．mastered
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