单项选择题

They had talked only for a few minutes（）they found they were of different opinions.

A. unless
B. while
C. before
D. once

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The sales manager had his secretary（）a press conference for their new products.

A. arrange
B. to arrange
C. have arranged
D. arranged
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Alan is looking forward to（）his American partner at the trade fair.

A. meet
B. meeting
C. be meeting
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