单项选择题

It was not until dark ______ it was time to return home.

A．that he realized
B．that did he realize
C．when he realized
D．when did he realize
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单项选择题
She stayed at home during the whole summer vacation ______ she could look after her old grand- mother.
A．in case
B．now that
C．so that
D．as though
单项选择题
The designer himself is not sure whether this software is appropriate ______ children under 12 years old.
A．with
B．in
C．for
D．of
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