单项选择题
A.Science
B.Scientist
C.Scientific
D.Scientists
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单项选择题
A.afterB.beforeC.whenD.as
A.after
B.before
C.when
D.as
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单项选择题
A.despiteB.in spiteC.thoughD.however
A.despite
B.in spite
C.though
D.however
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