单项选择题

Tom has been a vegetarian ______ principle for years.

A. in
B. on
C. for
D. by
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单项选择题
If it ______ too much trouble, I'd love a cup of te
a.A. isn'tB. wasn'tC. weren'tD. hadn't been
单项选择题
I'd rather you ______ those important documents with you.
A. don't take
B. didn't take
C. won't take
D. not take
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