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
 We ______ more time to play sports if our teachers ______ us less homework.
#41157
A
will have; give
B
have; will give
C
have; give
D
will have; will give
In front of the gate of the park ____ like an umbrella covering the entrance.
#70037
A
an old pine tree stood
B
an old pine tree did stand
C
did an old pine tree stand
D
stood an old pine tree