单项选择题

I found ______ hard to concentrate.

A. this
B. that
C. it
D. what
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单项选择题
None of us expected the president to ______ at the party. We thought he was still in hospital.
A. turn in
B. turn down
C. turn out
D. turn up
单项选择题
______ hold the VIP Card will be free of charge for this service.
A. People
B. Those people
C. Those ones
D. Those who
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