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
—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
— 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
—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
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
Today many physical bookstores ________ down with financial difficulties, inflexible management strategies and competitive pressure from online bookstores.
#105310
A
had closed
B
having closed
C
being closed
D
are closing