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

So loudly ______ that people could hear it out in the street.

A．did the students play the music
B．the students playing the music
C．the students played the music
D．have the students played the music

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