—Does he know how to work out the problem? —Yes, he has _______ a good idea to solve it.
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A
caught up with
B
kept up with
C
come up with
D
put up with
推荐题目
 Kate  ________    on her new novel, which is supposed to come out next month.
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A
was working
B
had worked
C
will be working
D
has been working
His uncle went abroad in 2010, and _______since.
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A
has not been heard of
B
had not been heard of
C
had not heard of
D
has not heard of
He complained that this was the third time he            of the changes of the meeting date.
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A
would be informed
B
was informed
C
has been informed
D
has been informed
 It’s reported that in the past 50 years around 80 percent of Beijing’s courtyard houses ______.
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A
had wiped out
B
have wiped out 
C
have been wiped out 
D
had been wiped out