You can’t appreciate happiness _______ you have known sadness too.
#32333
A
because
B
when
C
though
D
unless
推荐题目
He wouldn’t leave the TV set, ________ he was going to have an important exam the next day.
#33222
A
even if
B
as if
C
as though
D
even
．You’d better get the problem solved as soon as possible ______ it becomes out of control．
#33130
A
when
B
before
C
since
D
unless
_______ a small number of Australians are bitten by spiders each year, most recover without any medical treatment.
#31526
A
While
B
Unless
C
When
D
Because
We should consider the students’ request the school library provide more books on popular science.
#32005
A
that
B
when
C
which
D
what