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
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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
单项选择题
Her friends helped her ______ after her sister was killed in a car crash.
A．pull off
B．pull out
C．pull through
D．pull on
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