单项选择题
A.bowls
B.jobs
C.machines
D.themselves
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单项选择题
A.theyB.someC.itD.we
A.they
B.some
C.it
D.we
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单项选择题
A.copiedB.developedC.foundD.learned
A.copied
B.developed
C.found
D.learned
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