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
Is _______ some German friends visited last week? 
#73757
A
this school
B
this the school
C
this school one
D
this school where
He started early _______he could get there before nine
#67727
A
in order that
B
because
C
so as to
D
in order to
The poor girl       across the road       a car knocked her down.
#41276
A
walked; while
B
walked; since
C
was walking; until
D
was walking; when