it was found that there are这句话的时态可以正确么?

I found that it was easy to heip others. it was in the room ＿he had studied for three years ＿he found lost pen.A.where that B.th...it was in the room ＿he had studied for three years ＿he found lost pen.A.where that B.that that C.that when D.where when求详细分析?为什么不选B it was ____he lost that he found it more valuable than everassince becausefor we found that和 we found it During studies,it is found that more than 60 percent of famous paintings since the 14th century During studies,it is found that more than 60 percent of famous paintings since the 14th century We found that it was very useful to learn English well.同义We found ___to learn English well. He found that it was important to learn English well.同义句转换He found ( ) ( ) to learn English well He found that it was important to learn English well.=He found ___ ___ to learn English well. 初二英语完形填空we found that it was ( )to learn chinese ,but it was very interesting 括号里 I found that it was easy to help others.如何改成简单句式确定 it was found that 后面的跟的动词用原型还是过去式 I found it was pleasant to be with your family that为什么省略? i found that it was difficult to do the math problem改简单句 Everyone found that it was funny to talk with Dr.Hong.(改简单句) 怎么分析It was where i had left them that i found my lost books. it was found that there are这句话的时态可以正确么? 英语翻译New Zealand was the heavenly land of birds.New Zealand's biota was so strange that it would be dismissed as science fiction if the fossil(化石) record were not there to prove it.There were some 70 kinds of birds found nowhere else in th