——Do you know him well ?——Sure .We ___friends since ten years ago.A.were B. have been C.have become D.have made 答案是B ,为什么?求解释.

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——Do you know him well ?——Sure .We ___friends since ten years ago.A.were B. have been C.have become D.have made 答案是B ,为什么?求解释.
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——Do you know him well ?——Sure .We ___friends since ten years ago.A.were B. have been C.have become D.have made 答案是B ,为什么?求解释.
——Do you know him well ?——Sure .We ___friends since ten years ago.
A.were B. have been C.have become D.have made
答案是B ,为什么?求解释.

——Do you know him well ?——Sure .We ___friends since ten years ago.A.were B. have been C.have become D.have made 答案是B ,为什么?求解释.
首先,答句的时间短语是since 10 years ago,这和for ten years是一样的效果,所以横线上的谓语动词需要是完成时的可延续性动词,become和made都是非延续性的瞬时动词,所以选B.

SINCE 自从，常用于现在完成时，排除A ，而C 与D 是终止性动词，不能与SINCE 连用。
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SINCE 自从，常用于现在完成时，排除A ，而C 与D 是终止性动词，不能与SINCE 连用。
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since+过去的时间，前面用现在完成时

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