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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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
单项选择题
She didn't go to the cinema last night, _______she had to finish her term paper.
A． as
B． if
C． till
D． though
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