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
考查狀語從句的省略�！霸阱薰窌r注意不要松手，否則狗會威脅到陌生人�！盬hile （you are）walking the dog---
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