单项选择题

I would have come sooner but I（）that you were waiting for me.

A. didn't know
B. don't know
C. hadn't know
D. haven't known

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单项选择题
The little girl（）dance before so many guests,（）she

A. doesn't dare to; dare
B. daren't does; does
C. dares not; dare
D. daren't; dare
单项选择题
It was not until 1920（）regular radio broadcasts began.

A. while
B. which
C. that
D. since
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