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

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