As early as his second film, Chaplin had developed his own manner of acting, the one that ________world famous.
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A
would become
B
had become
C
was to become
D
became
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Every possible means ___ to prevent the air pollution, but the sky is still not clear．
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A
is used
B
are used
C
has been used
D
have been used
.People in developed countries are supposed ______ more healthy food before than what they have today.
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A
to be had
B
to have
C
had
D
to have had
--You look so pale.What trouble you? ----I ___ my dead mother.
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A
though about
B
was thinking about
C
have thought about
D
am thinking about