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
Marbles ______ once not confined to children.
A．was
B．is
C．were
D．are
单项选择题
Neither my classmates nor I ______ sure that all of us will be able to pass this exam.
A．am
B．is
C．are
D．be
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