单项选择题

______, my father came back home.

A. While I was reading the book
B. When reading the book
C. Having read the book
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单项选择题
I ______ go to bed ______ I finished my homework.
A. didn’t...until
B. doesn’t...until
C. didn’t...since
单项选择题
They have a meeting every Monday ______ there is nothing to discuss.
A. although
B. unless

C. whether
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