We were about to start out________ our friends called us up from Shanghai.
#31167
A
when
B
while
C
until
D
before
推荐题目
You can go out, _________you promise to be back before 11 o'clock. 
#31525
A
as far as
B
so far as
C
when
D
as long as
He _______ his gun under the tree where he was __________.
#32988
A
lay; laying
B
laid; lying
C
lied; laying
D
lay; lying
The old man lost his money and he has been worried ________.
#33629
A
even if
B
even as
C
ever since
D
as if