单项选择题

The skipper was not willing to risk ______ his ship through the straits until he could see where he was going.

A．taking
B．to take
C．having taken
D．being taken
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单项选择题
Nell's father said to him that he was ______ dog to learn new tricks.
A．so old a
B．a too old
C．too old a
D．a so old
单项选择题
When the report was published, various environmental groups criticized it for being too ______.
A．alert
B．zealous
C．meek
D．gregarious
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