单项选择题

We adopted the new methods with a view to ______ our efficiency.

A．raise
B．raising
C．rise
D．rising
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单项选择题
We must study English well, no matter ______ difficult it is.
A．what
B．however
C．how
D．that
单项选择题
I expressed hope ______ they would come to visit China again.
A．that
B．as
C．although
D．whether
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