The fact has worried many scientists ________the earth is becoming warmer and warmer these years.
#31168
A
what
B
which
C
that
D
whose
推荐题目
He tried his best to solve the problem, ______ difficult it was.
#33187
A
however
B
no matter
C
whatever
D
although
_______ I accept that he is not perfect, I do actually like the person.
#31324
A
While
B
Since
C
Before
D
Unless
----- Where will I put the MP4?----- Put it ______ we can all see it.
#31102
A
when
B
since
C
where
D
unless
You needn’t take your shoes off when you enter someone’s house in Australia , _____ , of course , they’re very dirty .
#34326
A
before
B
since
C
when
D
unless