It was 1920 ______ regular radio broadcasts began.
#32553
A
while
B
when
C
that
D
since
推荐题目
______ his father and stepfather were Muslim, American newly-elected black president, Barack Obama is Christian.
#34443
A
Whether
B
What
C
When
D
While
Lucy is a very optimistic girl. ______ she is faced with difficulties, she always sees the bright side.
#30212
A
Every time
B
Now that
C
As soon as
D
On condition that
The reason __________ she gave for not finishing the homework is that she was ill.
#31173
A
why
B
what
C
that
D
for
We had just covered a distance of three miles the engine and the car came to a stop
#32692
A
then; was broken
B
when; broke down
C
until; was failed
D
since; burst out