单项选择题

I ______ my teacher to write a reference letter to me if I see him.

A．have asked
B．ask
C．will ask
D．asked
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单项选择题
He rescued the boy from drowning at the ______ of his own life.
A．cost
B．price
C．expense
D．charge
单项选择题
He's not ______ to learn German in six months.
A．capable
B．can
C．enable
D．able
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