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单项选择题
A.contribute
B.attribute
C.subtract
D.contract
单项选择题
A.compulsory
B.suitable
C.alternative
D.optional
单项选择题
A.in brief
B.in sequence
C.in short
D.in particular
单项选择题
A.overtook
B.undertook
C.underwent
D.withstood
单项选择题
A.possibility
B.control
C.influence
D.pressure
单项选择题
A.debate
B.dispute
C.argument
D.quarrel