单项选择题

It was not until 1920 ______ regular radio broadcasts began.

A.when
B.which
C.that
D.since
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单项选择题
A.Go to Japan.B.Change her job.C.Go to night school.
A.Go to Japan.
B.Change her job.
C.Go to night school.
单项选择题
A.He worked there.B.He wanted to talk to Kate.C.He wanted to have a letter typed.
A.He worked there.
B.He wanted to talk to Kate.
C.He wanted to have a letter typed.
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