It was 1920 ______ regular radio broadcasts began.
#32553
A
while
B
when
C
that
D
since
推荐题目
（2014年安徽省合肥市高三第三次教学质量检测）28. Let's take a bus or taxi to the park — ______ you'd prefer to walk.
#30027
A
since
B
in case
C
unless
D
now that
He was about to tell me the secret _________ someone patted him on the shoulder.
#31950
A
as
B
until
C
while
D
when
_________you have a rich knowledge of Chinese history, try acting as a guide for these foreign visitors.
#31038
A
Unless
B
Though
C
Now that
D
Ever since
--Sir, I feel it complicated to apply to a university abroad.--Why not read our guide? This is ________ the relevant information is available.
#31218
A
what
B
how
C
where
D
that
We should go to the cinema early. __________, there won’t be any tickets left.
#30718
A
However
B
Otherwise
C
Besides
D
Instead