____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
Bill Gates has created a wonderful “window” ______ people can surf the Internet freely．
#94140
A
that
B
which
C
where
D
when
.We don’t have to feel curious about him. Actually he leads _______ we ordinary people do.
#94180
A
as a life normal as
B
as normal as
C
as normal a life as
D
as a normal life as
—Would you prefer to attend a private tutor?—I’d rather _____ for a class than _____ a tutor.
#93303
A
sign up; have
B
to sign up; have
C
sign up; to have
D
to sign up; to have
Do you have any ideas ________ is actually going on in the classroom?
#95097
A
that
B
what
C
as
D
Which
—Oh dear ! I’ve just broken a window .—_______ .It can’t be helped .
#95193
A
Never mind
B
All right
C
That’s fine
D
Not at all