_ we were walking along the river, we heard a cry for help.
#55724
A
While
B
Until
C
After
D
Before
推荐题目
—________does your father play table tennis? —Twice a week.
#56158
A
How long
B
How often
C
How soon
D
How far
____ it snowed heavily yesterday, nobody in our class missed the lesson.
#58529
A
Though
B
Because
C
Unless
D
Since
Many people believe we will face environmental disasters _________ we completely change the way we live.
#57124
A
but
B
though
C
unless
D
until
