(2014山东省实验中学高三第二次模拟考试)6.Jack and Samantha ____________ for their wedding for a whole week but nothing is really done.
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A
have prepared
B
are prepared
C
have been preparing
D
prepared
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She ____ the book for 2 weeks .
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A
has lent
B
has borrowed
C
has bought
D
has kept
______ __ a reply, he decided to send another e-mail. 
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A
Not receiving
B
Receiving not
C
Not having received
D
Having not received
I would have come earlier, but I _____ that you were waiting for me.
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A
didn’t know
B
hadn’t known
C
haven’t known
D
wouldn’t have known