1.It is generally considered that the key ____ a foreign lan

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1.It is generally considered that the key ____ a foreign language well is nothing but practice.
A.to learning B.to learn C.of learning D.for learning
2.As is known to all,it is Newtonwho ___ the laws of gravity.
A.invented B.discovered C.noticed D.made
3.Anna got good grades ____ and in the end she won a prize.
A.in studying hard B.in being studied hard
C.by studying hard D.by being studied hard
标答：A.B.C.

第一道,key 后面加to 做什么事情的关键,固定搭配,为什么用learning .是因为后面是一件事,学好英语!动词的ing 形式做主语!第二题,牛顿发现定理,不是发明,注意或制造!那东西本来就存在,只能去发现!第三题,by 通过这种方式,后面动词的ing 形式

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