单项选择题

A.laid
B.are laying
C.are laid
D.are lying
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单项选择题
A.at a timeB.at timesC.at timeD.in time
A.at a time
B.at times
C.at time
D.in time
单项选择题
A.operationsB.utilizationC.accomplishmentsD.extreme importance
A.operations
B.utilization
C.accomplishments
D.extreme importance
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