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【单选题】
设全集 U={1,2,3,4,5,6}, 集合 A={1,3,4}, 则A.
{1,2,3,4,5,6}
B.
{1,2,3}
C.
{1,3,4}
D.
{2,5,6}
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B.
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C.
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【单选题】－Oh, my God! I can't find my key to the office. －Don't worry. Perhaps it _________ at your home.
A.
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A.
left
B.
has left
C.
was left
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【单选题】Should We Discourage People from Using Cars? Nowadays the fast increase in the number of cars has brought about many problems, which are worth our greatest attention. What are those problems? In order...
A.
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B.
Factory waste
C.
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