It is already well understood___________ causes the global warming.
#70555
A
what
B
when
C
how
D
that
推荐题目
He is a dishonest man. _________ he said to us, we didn’t believe him.
#41328
A
Wherever
B
Whenever
C
However
D
Whatever
Do you still remember the rider and his new bike we saw in the street last week?
#70085
A
which
B
who
C
that
D
whom
I have always been honest and straightforward , and it doesn't matter_______I'm talking to.
#74015
A
Who is it
B
who it is
C
it is who
D
it is whom