______ there are living creatures in the outer space as those on Earth hasn’t been proved so far.
#13957
A
When
B
How
C
If
D
Whether
推荐题目
With economy developing at great speed, our city has ________ quite a few changes in recent years.
#11390
A
witnessed
B
accumulated
C
arisen
D
introduced
(2013·高考湖北卷)In much of the animal world，night is the time________for sleep－pure and simple.
#11936
A
set aside
B
set down
C
set off
D
set up
. _________ is known to all, good friends _________ happiness and value to life.
#12695
A
It; add
B
As; add
C
It; add to
D
As; add to
Education should not be considered to be a(n) ______ in a modern society.
#12490
A
privilege
B
acquaintance
C
advantage
D
affection
_________money has been invested to promote the traffic conditions of this city.
#11209
A
A plenty of
B
A large amount of
C
A great number of
D
A large sum