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He felt frustrated when he found () impossible to catch up w

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He felt frustrated when he found () impossible to catch up with heis classmatens
classmates
A it
B it is
我感觉都可以啊?
B为何不可?
He felt frustrated when he found () impossible to catch up w
1.答案:A.
2.翻译:当他发现不可能赶上他的同班同学们时,他感到很沮丧.
3.
1)答案A为典型的“及物动词find + 形式宾语it + 宾语补足语impossible + 真正宾语to catch...”结构.
有上述结构的动词一般有如下五个:find/make/feel/think/consider.
此结构的宾语补足语一般用形容词/名词充当,而真正的宾语一般由不定式(复合结构)或that从句充当.
2)上述结构经常可以转化成:find/feel/think/consider(make不可以)+ that从句.
而且该that从句结构为:it be + 形容词/名词(即上述结构的宾语补足语) + (for sb)+ to do sth/that从句.
如:I found it easy to learn English.
= I found (that) it was easy to learn English.
3)该题答案B之所以错误,原因很简单,就是这个从句的时态必须和主句时态found一致(都采用一般过去时),即be动词是was,而不是is.