____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
Rather than ____his car on the busy road, Mr. Green always prefers____ his bike.
#93603
A
drive; to ride
B
driving; ride
C
to drive; riding
D
to drive; ride
We left the meeting, there obviously __________ no point in staying.
#95169
A
were
B
being
C
to be
D
having
. ______ it rains when we can’t find a place to escape from the rain?
#94087
A
What if
B
How come
C
What about
D
How about
．—________the population of Shandong Province?—I can't say exactly, but I know it ________ about 80 million.
#91861
A
What's; has large population
B
How much is; has the population of
C
How many is; has a large population
D
What's; has a population of
_____ is little doubt that the Chinese women basketball team will beat the Japanese team.
#94838
A
It
B
That
C
There
D
Which