I had been puzzled over the problem for over an hour without any result, all at once a solution flashed across my mind.
#33232
A
while
B
when
C
then
D
as
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
________ the fire breaks out，he is the first to arrive at the scene.
#30229
A
Every time when
B
Moment
C
No matter whenever
D
Every time
John got his phone for his birthday, his parents don’t let him use it in school.
#31990
A
however
B
which
C
but
D
when
The president did much for world peace. That was ______ he was awarded the Nobel Peace Prize.
#30374
A
when
B
what
C
because
D
why