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

After final examination, college students who have left their homes for a long time look forward to（）as soon as possible.

A. be going home
B. go home
C. be gone
D. going home

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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