高中完型英语题He finally agreed. So I was able to clean his house a

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高中完型英语题
He finally agreed. So I was able to clean his house and wash his clothes.I discovered a beautiful lamp,covered with dust,but still attractive. Only God knows how many years had passed ( ) he last lit it.
选项中有after和since
请问为什么选since不选after.
从句是after引导主句可以用完成时吗?
前面的knows为什么是一般现在时?

这道题目选择since,因为since引导的从句的上级句子用的是“过去完成时”,这里的since表示“自从”,after引导的从句后面,主句一般不用完成时,因为after表示的是主句的行为发生在从句行为之后,所以after引导的从句常常用过去完成时或现在完成时,但主句用的是过去式或现在时,before引导的从句后面主句才可以用完成时.
knows用一般现在时表示一种客观真理,或者客观事实,在任何情况下都用一般现在时,如：
Our teacher told us that the earth turns around the sun.
The teacher said that the world is round.
The teacher said that heavy objects and light ones fall at the same speed.
希望我能帮助你解疑释惑.

高中完型英语题He finally agreed. So I was able to clean his house a His plan was such a good one_we all agreed to accept it.A.so I was finally able to remember your smile. 11.Her hurt his eyes so( ) that he was never able to see ( ) 翻译In the end I was able to make a large house in the country His house was washed away by the flood ,so he had to have hi The days __and the boy was finally able to tell his father t Harryis house was far from his company.The boss agreed(to le Finally,I was able to ______what I wanted to say in the firs Alone in a deserted house,he was so busy in his reseach work 1：Alone in a deserted house,he was so busy with his research I had a map of the town,so I was able to find my way around.