单项选择题

The farmers had to wear heavy boots in the winter because the fields were so wet and ______.

A．dusty
B．earthy
C．soiled
D．muddy
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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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He rescued the boy from drowning at the ______ of his own life.
A．cost
B．price
C．expense
D．charge
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