单项选择题

While( ), she wrote a novel.

A. at college
B. is at college
C. college
D. she at college
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It is not clear yet when the teachers( )strike will return to their classrooms.
A. in
B. at
C. on
D. from
单项选择题
If( ),please let me know by this evening.
A. is possible
B. possible
C. it possible
D. possibility
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