He was riding to school   he was hit by a car this morning. 
#41376
A
while
B
when
C
as
D
so
推荐题目
There’s little doubt _____ we will _____ the game.
#73970
A
that , win
B
whether , win
C
whether , beat
D
that , beat
____ I’ve known your situation, I’ll send the money to you imediately.
#72088
A
Now that
B
In case
C
On condition that
D
So long as
I was about to leave the office ______ the telephone rang.So I stopped ______ it.
#70104
A
when; to answer
B
when; to reply
C
while; answering
D
as; replying