---What are you going to do this weekend ?--- Well, we’ll clean up the city parks ________ it rains..
#41095
A
if
B
until
C
while
D
unless
推荐题目
On returning from work, _____.  
#70204
A
John found a letter in the mailbox
B
a letter was found in the mailbox  
C
a letter was in the mailbox
D
the mailbox had a letter in it
Only when       possible to settle the problem.
#67697
A
our teacher comes will it be
B
does our teacher comes will it be
C
our teacher comes it will be
D
has our teacher come will it be