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
What does the mother ask the boy to do（）

A. To drink a lot of water only.
B. To stay in bed.
C. To go to see the doctor immediately.
D. To watch the basketball match.
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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