单项选择题

Those students don't have to be made ______. They are all diligent students.

A．learn
B．learned
C．learning
D．to learn
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单项选择题
Your arguments are ______ to criticize.
A．invulnerable
B．insensitive
C．insusceptible
D．'defenseless
单项选择题
The farmer had to wear heavy boots in the winter because the fields were so wet and ______ .
A．earthy
B．muddy
C．soiled
D．dusty
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