题目内容

While ____ the dog, you should take care not to get loose . Otherwise, it may be dangerous to strangers.
A．walking;B．walkedC．walking forD．training for
A
考查状语从句的省略。“在遛狗时注意不要松手，否则狗会威胁到陌生人。”While （you are）walking the dog---
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