单项选择题

They ______ gave us a presentation.

A. every
B. everyone
C. each
D. each one
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单项选择题
______for your help, we' d never have been able to get over the difficulties.
A. Had it not
B. If it were not
C. Had it not been
D. If we had not been
单项选择题
Nobody came to see me while I was out, _____
A. did they
B. didn't they
C. did she
D. didn't she
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