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
Ted couldn't remember the exact date of the storm, but he knew it was Sunday because everybody was at ______ church.
A．/, the
B．a, /
C．/, a
D．the, /
单项选择题
______ time, he'll make a first-class tennis player.
A．Having
B．Given
C．Giving
D．Had
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