I like sleeping with the window open ______ it’s too cold.
#55740
A
if
B
when
C
until
D
unless
推荐题目
– _________ do you go to your school library?– Three times a month
#58110
A
How long
B
How often
C
How much
D
When
My father feels ________ because he heard from ________ today. 
#58571
A
happy;an old friend of he
B
happy;an old friend of his
C
happily;one of his old friends
D
happily;an old friend of him
 No matter what you do, you can’t change the situation.
#55515
A
whoever
B
wherever
C
whatever
D
what ever