____some doubt among scientists about the cause of cancer.
#92930
A
It exists
B
There exists
C
There is existing
D
It is existing
推荐题目
He was admitted to a famous university，________ was obvious that his situation had gone beyond his parents’ expectations.
#93461
A
what
B
it
C
as
D
and it
It’s clear__________ that a hard working student has___________ a great interest in science.
#94994
A
不填; discovered
B
不填; developed
C
that; invented
D
that; developed
In my opinion, the idea of a family is much narrower than ________.
#91968
A
that used to be
B
it used to
C
it was used to
D
it used to be
How pleased the detective was _____ what his customer told him
#94737
A
hearing
B
heard
C
to hearing
D
to hear