单项选择题

We must study English well, no matter __________ difficult it is.

A．what
B．however
C．how
D．that
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The area of Beijing is about __________ that of my hometown.
A．5 times as larger as
B．as 5 times large
C．as 5 times larger than
D．5 times as large as
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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