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.
填空题
healthy surroundings
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