1.He pretended __________ when his mother stepped into his r

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1.He pretended __________ when his mother stepped into his room.
A.to study B.studying C.to be studying D.to have studied
★为什么不选A而选C?
2.The old house,where I lived about five years ago and that I visited,had a garden.
★that I visited能改成which I visited吗?
3.Guilin is a city that has a history of 2000 years.
★that能改成which吗?

第一题选择C!
pretend to do sth 假装做某事
petend to be studying 假装正在学习,
从when his mother stepped into his room可以判断出要用进行时态be doing
第二题,可以改,多数情况下定语从句里面可以用which就可以用that
第三题,可以,如上所述.
【欢迎追问,谢谢采纳!】
再问：第一题为什么不用主动形式pretend to do sth?
再答： petend to be studying 假装正在学习，从when his mother stepped into his room可以判断出要用进行时态be doing 此题我们期末考原题，当时答案就是to be doing
再问： ............................................就像我问你为什么音响会发声，你就说因为音响会发声
再答：不是说了吗，pretend后两种用法，都是主动，只要是pretend to do就是主动但是按照句意写的是当。。。时候，因此用petend to be studying 假装正在学习。

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