Learning to write is learning to think. You don’t know things clearly _______ you can write them down.
#56362
A
unless
B
if
C
since
D
whether
推荐题目
—Tom, you look tired this morning. What’s wrong?—I was so busy that I didn’t go to bed _____ 12 o’clock last night.
#58255
A
until
B
when
C
though
D
unless
--Would you like to go bike riding with us tomorrow? ---Sure, ____ I am busy.
#57365
A
since
B
unless
C
when
D
until
一I’ m going to the Century Mart.—________ you’re there、can you get me a bag of salt?
#55949
A
As
B
While
C
Because
D
If
— What’s your plan for this weekend? — We will go for a picnic by the river _______ it rains.
#56007
A
unless
B
if
C
but
D
because
