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
______ of danger in the street at night, she had to go home, with a friend _____ her.
#101448
A
Warned ; accompanied
B
Warning; accompanying
C
Having warned; accompanied
D
Having been warned; accompanying
No decision _ about any future plan until we have done some research into the student preference．
#101572
A
has been made
B
is made
C
is being made
D
will be made
During next June and August he _________ in the field with his parents.
#103879
A
was working
B
will be working
C
will work
D
has worked
– Will you be able to see Jennifer’s parents when the first class is over?– I’m afraid not. I ______ a lecture on British literature in the hall.
#102107
A
will attend
B
am attending
C
am going to attend
D
will be attending
J. K. Rowling ________ writing Harry Potter at a local caf because she could not afford to heat her home.
#99465
A
started
B
starts
C
has started
D
had started