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The old man with his son_______ the street carefully when th

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The old man with his son_______ the street carefully when the traffic light was red.
A.were crossing B.crossed
请问正确答案为什么是B
为什么不是A
The old man with his son_______ the street carefully when th
因为主语是the old man ,谓语要用单数.英语中当主语后带有with,together with,as well as,rather than,except ,but等介词短语时,谓语动词不受这些介词短语的影响,而应和主语保持一致.你可以参考主谓一致的语法