单项选择题

The mother was afraid to let the boy ______ the tree.

A．to risk climbing
B．risk climbing
C．to risk to climb
D．risk to climb
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单项选择题
The country's chief exports are coal, cars and cotton goods, cars ______ the most important of these.
A．have been
B．are
C．being
D．are being
单项选择题
She has taken great pains to conceal her emotions, and thereby made them ______ conspicuous.
A．all the more
B．all the much
C．all more
D．all much
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