单项选择题

The parents thought that their only child was not yet ______ to be independent.

A．enough old
B．so old
C．old enough
D．too old
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单项选择题
Please tell him that he can dial 110 ______ emergency.
A．in the case
B．in a case of
C．in case
D．in case of
单项选择题
This young man is so versatile in writing that he often ______ a poem.
A．throws down
B．throws off
C．throws back
D．throws away
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