1.She is always regretting not ______ hard when she was at school.
A.to study B.to have studied C.to studing
D.having studied

2.Why do you want a new job _____ you' ve got such a good one already?
A.that B.where C.which D.when

3.To save the earth, we must prevent it from _______.
A.polluting B.polluted C.to be polluted
D.being polluted

4.In the past five years, many new houses hvee been built in our village. It will never be _________ it used to .
A.that B.what C.one D.a one

5.The family mught have been killed ____ the arrival of the police.
A.except B.expect C.but D.refer to

谁会解释解释~~ 别题题都说固定搭配！

1.She is always regretting not ______ hard when she was at school.
A.to study B.to have studied C.to studing
D.having studied
选D.regret doing/having done“后悔做过了某事”regret to do“遗憾的要做某事” 因为上学时没有努力学习，现在后悔了。

2.Why do you want a new job _____ you' ve got such a good one already?
A.that B.where C.which D.when
选D.when有“当...时，如果，既然，虽然”的意思。“既然你现在有了一份好工作，为什么还想找新的呢？”

3.To save the earth, we must prevent it from _______.
A.polluting B.polluted C.to be polluted
D.being polluted
选D。“为了拯救地球，我们必须组织地球受到污染。”意为地球只能作为污染的对象，所以用被动式。
prevent sb from doing阻止某人做某事
prevent sb from being done阻止..被...

4.In the past five years, many new houses hvee been built in our village. It will never be _________ it used to .
A.that B.what C.one D.a one
选B.首先确定one ,ones不能引导从句。that引导的不是定语从句，因为前面没有先行词（名词）。它引导表语从句时，从句必须是完整的，因为that此时不担任句子成分。what引导表语从句，并且能够在从句中作主语或宾语。“在过去的五年中，我村建了许多新房子。它再也不是过去的（它）了。”

5.The family mught have been killed ____ the arrival of the police.
A.except B.expect C.but D.refer to
我会选C.但觉得应填but for“要不是”“要不是警察的到来，这家人也许已经遇害了。”
A“除了”B“期待”D“指的是，参考，提及”
6.The old man went to the information center soon after his arrival as the city _________ so much.
A.has changed B.changes C.has changed
填had changed因为主句是过去式went,在那之前这城市就已经变化了，所以用过去完成时。