7.Although the causes of cancer ____， we do not yet have any practical way to prevent it.
#105343
A
are being uncovered
B
have been uncovering
C
are uncovering
D
have uncovered
推荐题目
Though the medicine for my disease______, I should often______ at home or in the open air.
#105327
A
works out; work out
B
is working; work out
C
is working out; work
D
works; work
—Joan，what ________ in your hand?—Look！It's a birthday gift for my grandma.
#105314
A
had you held
B
are you holding
C
do you hold
D
will you hold
The College Entrance Examination________near, so you should be prepared for it.
#105333
A
is drawing
B
draws
C
drew
D
has drawn
I’m glad to see your health ______ after the operation.
#105301
A
picking up
B
setting up
C
taking up
D
getting up
—What are you putting your shoes on again for?—Because I________you home, that’s all!
#105304
A
drive
B
am driving
C
have driven
D
drove