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【单选题】
Mr. and Mrs. Black ______ back _________.A.
hasn’t come, yet
B.
haven’t come , yet
C.
haven’t come， already
D.
hasn’t come , already
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举一反三
【单选题】Because pollution reduces economic welfare, on this count real GDP as measured
A.
decreases as pollution increases.
B.
increases to take into account the expenditures that will be made in the future to clean up the pollution.
C.
overstates economic welfare.
D.
understates economic welfare.
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