________ 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
It was April 29, 2010 Prince William and Kate Middleton walked into the palace hall of the wedding ceremony.
#30692
A
that
B
when
C
since
D
before
----- Our holiday cost a lot of money. ----- Did it? Well, that doesn’t matter ________ you enjoyed yourselves.
#32310
A
unless
B
as soon as
C
as long as
D
though
.I was about to leave_________I saw him_______ towards me, with a bag in hand.
#34281
A
while; running
B
when; running
C
as; ran
D
when; to run
Jane had just finished her homework ________ her mom asked her to practice playing the violin yesterday.
#30845
A
when
B
while
C
after
D
before
It will be quite a long time _______ she is back again, so don’t be too cross with her.
#31578
A
before
B
since
C
that
D
until