A．at
B．by
C．within
D．on
请帮忙给出正确答案和分析，谢谢！
A．inB．byC．atD．on
【C19】A．atB．fromC．offD．on
【C12】A．atB．byC．inD．for
The company is in good order _____ adopting advanced management.A: atB: byC: forD: wit
【C10】A．atB．overC．underD．on
【C18】A．atB．inC．forD．on
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