英语单选1.So difficult ( )it to work out the problem that I deci

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英语单选
1.So difficult ( )it to work out the problem that I decided to ask Lily for help.
A.do I find B.did I find C.would I find D.have I find
我选D为什么
2.My teacher advised the dictionary ( )be bought in three days.
A.refer to B.referring C.referred to D.to refer
3.My computer wants ( ).It's out of control.
A.to repair B.being repaired C.repaired D.repairing
4.Manybusinessmen attended the Boao Forum because they knew what ( )from it.
A.getting B.to be got C.got D.to get

1 主句和从句的时态要统一,都用过去时
2 统一时态（过去时）
3 应该选A 答案错了
4 选项在从句中做主语,所以要用不定式

So difficult it to work out the problem that i dicided to as So difficult __ it to work out the problem that I decided to 1.The math problem is so difficult that I can't work it out. So difficult __it to work out the problem that i decided to The problem is so difficult that I can't work it out.同义句 The problem is so difficult that nobody can work it out(改为同义 The problem was so difficult that we couldn't work it out ea It's clever for him to work out the difficult math problem.单 He found it difficult to work out the problem. The math problem was so difficult that I couldn't work it ou I find the problem difficult to work out. I find difficult to work out the problem.