单项选择题

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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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

单项选择题

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

A. both
B. none
C. either
D. neither

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