单项选择题
A.found
B.invented
C.created
D.discovered
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单项选择题
A.slip upB.show upC.slow downD.slip down
A.slip up
B.show up
C.slow down
D.slip down
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单项选择题
A.althoughB.whileC.asD.since
A.although
B.while
C.as
D.since
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