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这两题有什么区别?1.Tomdidnothingelsebutbackallhisfriendsowedhim.()A.totakeB.tookC.takingD.take2.Hasheanyotherchoicebutasyoutellhimto?()A.todoB.doC.doingD.did请说明一下怎么区别but后+do还是+todo,

题目详情
这两题有什么区别?
1.Tom did nothing else but___back all his friends owed him.( )
A.to take B.took C.taking D.take
2.Has he any other choice but____as you tell him to?( )
A.to do B.do C.doing D.did
请说明一下怎么区别but后+do还是+to do,最好以这两道题作为例子,
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答案和解析
..but to do ..,在前面的动词是do和它的变形是将to省略
口诀为:前有do,后省to.(我们老师讲的)