the school was a very difficult period of my life.i first met him at that time 合并为定语从句

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• the school was a very difficult period of my life.i first met him at that time 合并为定语从句
• the school was a very difficult period of my life.i first met him at that time 合并为定语从句
• We found _____very difficult to learn Japanese.A. its B. it C. that D. this这道题我知道选it,但是,选it依据的是什么,这个我不太清楚,请高手给个确切的答案,谢谢!
• 句型转换 We find that it is difficult to learn several languages at the same time .We find____ ____ _____ _____ several languages at the same time.