susan found (it) not easy to answer all these questionsfound 为什么啊 these questions 应该用them a thatb itc themd this

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susan found (it) not easy to answer all these questionsfound 为什么啊 these questions 应该用them a thatb itc themd this

susan found (it) not easy to answer all these questionsfound 为什么啊 these questions 应该用them a thatb itc themd this
susan found (it) not easy to answer all these questions
found 为什么啊
these questions 应该用them
a that
b it
c them
d this

susan found (it) not easy to answer all these questionsfound 为什么啊 these questions 应该用them a thatb itc themd this
Susan found (it) not easy to answer all these questions.
Susan发现要回答所有的问题很困难.
find it +形容词+to do,发现做某事怎样.it并不是指questions,它只是个形式上的宾语,代替的是后面的不定式to answer...(这是真正的宾语).加上it在这个位置是为了让句子的结构更协调,不显得中间太臃肿.