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【单选题】
Intra-industry trade takes place:A.
because products are homogeneous
B.
in order to take advantage of economies of scale
C.
because perfect competition is the prevalent form of market organization
D.
all of the above
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A.
linked
B.
united
C.
joined
D.
connected
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A.
B.
C.
D.
D
【单选题】. ______ in bed, the boy ______ to his mother saying that he had a bad headache.
A.
lying; lay
B.
lied; laid
C.
Lying; lied
D.
Laying; lain
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