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
When you read books, you had better make marks（）you have questions.

A．where
B．in where
C．at which
D．which
单项选择题
She stayed at home during the whole summer vacation（）she could look after her old grandmother.

A．in case
B．now that
C．so that
D．as though
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