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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单项选择题
I expressed hope ______ they would come to visit China again.
A．that
B．as
C．although
D．whether
单项选择题
The report showed us clearly how the car got ______ and crashed at last.
A．into control
B．under control
C．within control
D．out of control
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