Although the causes of cancer ____we do not yet have any practical way to prevent it.
#105341
A
are being uncovered
B
have been uncovering
C
are uncovering
D
have uncovered
推荐题目
6.I have to go to work by taxi because my car ____at the garage.
#105344
A
will be repaired
B
is repaired
C
is being repaired
D
has been repaired
The aging population _____ each day .There must be some kind of interesting activity for the old.
#105312
A
has grown
B
grew
C
will grow
D
is growing
My money ________.I must go to the bank to draw some of my savings outbefore I've none in hand.
#105320
A
has run out
B
is running out
C
has been run out
D
is being run out
Tom, would you like to stop practising B-Box? The CCTV news____ and I want to listen.
#105325
A
is broadcasting
B
has been broadcasting
C
is broadcast
D
is being broadcast
5.―Have you handed in your schoolwork yet? ―Yes，I have. I guess it ____ now.
#105340
A
has graded
B
is graded
C
is being graded
D
is grading