——Do you know David well?——Sure. We       friends since ten years ago.
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A
are
B
have been
C
were
D
had been
推荐题目
Hearing his words, she left rather than _________ behind.
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A
stay
B
stayed
C
to stay
D
staying
Great changes _____ in this city over the past five years.
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A
tookplace
B
havetakenplace
C
weretakenplace
D
havebeentakenplace
 I used to drink a lot of tea but these days I _____ coffee.
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A
preferred
B
prefer
C
have preferred
D
am preferring