_________ there are certainly times when giving up trying is the right thing to do, in most cases all needed is commitment and communication.
#30109
A
Unless
B
Before
C
Although
D
Since
推荐题目
A curve is a line ______ no part is straight and which has no angle.
#30518
A
that
B
whose
C
in which
D
of which
____ I say Clancy is a smart boy, he still needs to work hard to achieve his goal．
#32619
A
Then
B
When
C
While
D
As
It even leaves the wise scientists in wonder____ they should call the newly-born creature, which looks half-human and half-animal.
#30514
A
what
B
how
C
why
D
that
___ China’s reform（改革）and opening up in fate 1978, its quick development has aroused worldwide attention.
#34534
A
When
B
As
C
While
D
Since