单项选择题

A business letter should be written in a formal style （） in a personal one.

A. better than
B. rather than
C. other than
D. less than

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There are so many dresses there that I really don't know（）to choose.

A. whether
B. when
C. which
D. why
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At the international conference, the famous scientist gave an excellent report（）on his recent experiment.

A. basing
B. based
C. to be based
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