—Mary，I don’t know ____ you can come tomorrow morning.—No problem! I’ll be here _____I’m free then.
#55784
A
if；if
B
if; whether
C
whether；till
D
whether；until
推荐题目
_________ people were watching the sky, the alien got out of the UFO.
#57263
A
If
B
When
C
Because
D
While
—You look so tired. What’s the matter?—I was so busy that I didn’t go to bed 12 o’clock last night.
#56595
A
until
B
unless
C
if
D
so
The cost of living in Chengdu is among the lowest in China, ________ the quality of life is probably one of the highest.
#56003
A
since
B
when
C
as
D
while