Living things are dying out quickly. Let’s ask ____ destroying them in the past years.
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A
what part people have been playing
B
people have played in
C
what part people have played in
D
people have been playing what part
推荐题目
__ was once regarded as impossible has come true.
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A
Who
B
Which
C
That
D
What
What ______ you ______ when you father came back?
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A
did, do
B
are, doing
C
were, doing
D
do, do
This is one of the best films _______. 
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A
that have been shown this year
B
that have shown
C
that has been shown this year
D
that you talked
Those were the graduate assistants ______ to do the research work in the lab.
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A
to whom it was their responsibility
B
whose responsibility there was
C
whose responsibility was
D
of whom with the responsibility