单项选择题

Mr. Peters has been in love with his wife （）they first met in 1997

A. after
B. until
C. while
D. since

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单项选择题

（）I was so angry, I tried to speak to him nicely

A. Although
B. After
C. Once
D. For

单项选择题

You must choose to study （）economics or philosophy; you can't do both

A. while
B. either
C. neither
D. not

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