单项选择题

He was speaking so fast______we could hardly follow him.

A．what
B．as
C．but
D．that
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单项选择题
How much does it______to take the online training course
A．cost
B．give
C．pay
D．spend
单项选择题
Please call me back______you see this message.
A．as well as
B．as early as
C．as far as
D．as soon as
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