单项选择题
A.at
B.with
C.under
D.for
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单项选择题
A.undertakingB.underliningC.understandingD.undergoing
A.undertaking
B.underlining
C.understanding
D.undergoing
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单项选择题
A.averageB.commonC.regularD.typical
A.average
B.common
C.regular
D.typical
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