I found ( )difficult to learn English grammarA.it B.that C.it is D.that is 请告诉我理由和为什么不选C

I found _____ difficult to english grammar. I found very difficult was English grammar这句话对不对? I found English grammar dull and difficult.这句话对吗? I found it difficult to remember everything.改为复合句 翻译I found it very difficult to win the game. I found very difficult was English grammar这句话对不对? i found that the question is difficult.that I found it difficult to fall a_ last night i first found Engilsh very difficult _____mewhat prep i found it difficult __________( fall )asleep last night The next question_was put to meby Mary.A.i found difficult an answerB.i found it difficult to answer C.that i found it difficult to answerD.i found difficult to answer it I found it difficult.等不等于 i found it is/was difficult?kankanI found it difficult to solve the problem.等不等于 i found it is/was difficult to solve the problem? I found dealing with the problem difficult.同义句 I found it 填空 填空 the problem. Another thing that I found very difficult was English gramarvery difficult为什么要放在那里?如何理解very difficult? Another thing I found very difficult was English grammar（用 i found 开头的同义句） I found it very difficult to learn maths well.我觉得应该是 I found that it is very difficult to learn maths well. Another thing that I found very difficult was English grammar.Another very difficult thing that I found 这样写可以吗? 英语翻译为什么是I found that learning English is very difficult,而不是I find that learning English is very difficult?Found在这里表示什么?