单项选择题

At the international conference, the famous scientist gave an excellent report（）on his recent experiment.

A. basing
B. based
C. to be based
D. to base

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I invited Tom and Ann to dinner, but（）of them came.

A. both
B. none
C. either
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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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