Although the causes of cancer_____, we do not yet have any practical way to prevent it.
#104936
A
are being uncovered
B
have been uncovering
C
are uncovering
D
have uncovered
推荐题目
---Are you happy about your present job?--- Why shouldn’t I ? I _____ as much , and I enjoy more.
#103557
A
am earning
B
earn
C
earned
D
have earned
---You are late again! We _________you could attend the assembly on time.---Sorry, I __________to my office to get my papers.
#101439
A
think, went
B
thought, have gone
C
think, were going
D
thought, went
The vegetables didn’t taste very good. They _______ too long.
#100525
A
had been cooked
B
were cooked
C
have cooked
D
cooked
----Have you ever seen Peter recently ?---Yes . He _____ me to ask you how you _____ along with your new job these days .
#104923
A
has asked ; have been getting
B
asked ; were getting
C
often asks ; are getting
D
asked ; are getting
— Has the little boy who saved the drowning girl left the school?— Not yet. He _______in Room203 of the teaching building right now.
#101974
A
in interviewing
B
is interviewed
C
has interviewed
D
is being interviewed