单项选择题

A.on
B.about
C.at
D.with
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单项选择题
A.presentedB.submittedC.describedD.written
A.presented
B.submitted
C.described
D.written
单项选择题
A.involvingB.countingC.coveringD.figuring
A.involving
B.counting
C.covering
D.figuring
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