________ there are living creatures in the outer space as those on Earth hasn't been proved until now.
#30306
A
How
B
When
C
Where
D
Whether
推荐题目
She thought I was talking about her daughter in fact，I was talking with my daughter.
#30615
A
whom
B
where
C
which
D
while
—Would you like to come to dinner tonight？ —I’d like to, ___ I’m too busy.
#80540
A
and...
B
so
C
as...
D
but
____ aware of the danger ahead, he took on the task without hesitation.
#34294
A
If
B
Though
C
Since
D
As
Mother told her son that it would be half a year ______ she could come back from American.
#32344
A
since
B
before
C
that
D
when
Everyone stood up______ the hero came into the lecture hall.
#80447
A
while
B
instant
C
every time
D
immediately