单项选择题
A.discovery
B.invention
C.search
D.research
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单项选择题
A.doesB.didC.had doneD.was doing
A.does
B.did
C.had done
D.was doing
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单项选择题
A.thoseB.thisC.theseD.them
A.those
B.this
C.these
D.them
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