关于不定式和动名词1)When he got off the bus,it happened_____A to rain

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关于不定式和动名词
1)When he got off the bus,it happened_____
A to rain B to be raining C raining D to raining
2)He is an experienced driver and he is used____on all kinds of roads.
A to driving B to drive C for driving D to have driven
3)_____pollution is the key to ____the country a comfortable and clean place to live in.
A To control;keep B To control;keeping C Control;keeping D Controlling;keep
为什么?
B A B 是为什么呢

1.B
happen to do：碰巧发生某事
选B而不选A是因为强调“雨正在下”.
2.A
他是一位有经验的驾驶员,习惯了在各种路段开车.
be\get used to doing习惯做某事
used to do过去常常做某事
3.D
控制住污染是使我们能够更舒适地生存下去的关键方法.
动名词做主语,不定式的话也可以做主语,但是是表目的的主语,例如：To win the game is a tough work to us.
不好意思,这题第二个空应该填keeping,the key to...后面应该接的是动名词；但是第一个空我认为是controlling.

关于不定式和动名词1)When he got off the bus,it happened_____A to rain When he got off the bus,it happend_B_. 1.When he got off the bus,it happened to be raining. We had hardly got on the bus when it began to rain.要如何翻译? It happened ( ) when I got off the bus in beijing hardly had he got home when it began to rain 非谓语的一些问题when he got off the train,it happened ( to be rainin When he got off the train,it happened---- When he got off the train,it happened_________. 1.When he got off the train,it happened_____ He got off the bus after it stopped.（同义句） He__ __ off the bu the boy got off the bus when he d_____ that he had left his