Whenadoghasbeen________trained,he

发布时间：2020-07-27 14:36:24

When a dog has been ________ trained, he can always lead his blind master in the right way and keep him out of danger．A.exactlyB.properlyC.rightlyD.really

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B解析properly“恰当地，适当地”；exactly“精确地，准确地”；rightly“正义地，公正地”。
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