单项选择题

There is no knowing ______ may happen in that case.

A．which
B．that
C．who
D．what
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单项选择题
In this chapter we will______the magnetic effects of the electric current.
A．deal with
B．deal in
C．trade with
D．drop in
单项选择题
They thought it ______ question to answer.
A．too difficult
B．too difficult a
C．a too difficult
D．too a difficult
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