12．There is a dog ________ in the yard（院子）now． A．run B．running C．runs D．is running

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12．There is a dog ________ in the yard（院子）now． A．run B．running C．runs D．is running
12．There is a dog ________ in the yard（院子）now． A．run B．running C．runs D．is running

12．There is a dog ________ in the yard（院子）now． A．run B．running C．runs D．is running
这是一个现在进行时态,be动词后加动词ing形式.选B

选B。院子里有条狗正在跑。因为后面有now，所以用现在分词做伴随状语表示进行。

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你好，同学，很高兴回答你的问题

正确答案：选【 B 】

现在有一只狗在院子里跑。

解析：因为后面有now，是现在进行时的标志，所以用running 是现在分词作后置定语，修饰a dog，也可以说用running现在分词作伴随状语，表示当时进行的动作或状态。
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答案选第二个 b

B．running

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