单项选择题

I couldn't the lecture at all. It was too difficult for me.()

A. take on
B. take in
C. take over
D. take upon

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单项选择题
They are working () time to fulfill the task according to the schedule.

A. against
B. over
C. ahead of
D. before
单项选择题
After the music had () there was a storm of applause.

A. died out
B. died hard
C. died off
D. died away
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