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【单选题】
曾经在元朝时访问中国许多古城的世界著名旅行家和商人马可〃波罗是（）人。A.
法国
B.
英国
C.
意大利
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A.
will be
B.
are to be
C.
can be
D.
were to be
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A.
is to be
B.
can be
C.
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has been
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【单选题】Great efforts to increase wheat production must be made if bread shortages ________ avoided.
A.
will be
B.
can be
C.
are to be
D.
were to be
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A.
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B.
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C.
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D.
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