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
----what do you think of the Chinese language today?----Quite popular. It______ in communicating with other countries. More and more foreign friends are learning Chinese.
#105332
A
plays an important role
B
is playing an important role
C
has played an important role
D
is being played an important role
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
______, your composition is full of mistakes.
#105329
A
Writing carelessly
B
Written carelessly
C
Having written carelessly
D
Being written carelessly
— ________ for the glass! —It’s OK. I’m wearing shoes.
#105336
A
Look out
B
Walk out
C
Go out
D
get out
— Who is ____ the TV show? She seems to be talented. — Mary Green, who used to be a great actress.
#105321
A
opening
B
hosting
C
playing
D
seeing