求详细解释（特别是第一个）

Thomas Edison is generally considered ______ the first telegraph． [　　] A．invented　　　　　　B．inventing C．to have invented　　　D．having invented “Clear the street ________ snow” is the same as “Clear the snow ________ the street”. [ ] A．of, from B．from, of C．off, away D．away, off

解题思路： 介词搭配
解题过程：
1Thomas Edison is generally considered ______ the first telegraph． A．invented　　　　　　B．inventing C．to have invented　　　D．having invented 句意：人们普遍认为世界上第一部电报机是Thomas Edison发明的。 解题思路：动词不定式的完成时态。 解题过程：我们要了解这几个句型： 1） People considered generally that Thomas Edison had invented the first telegraph．(宾语从句) 2） It was considered generally that Thomas Edison had invented the first telegraph．(主语从句) 3） Thomas Edison is / was generally considered to have invented the first telegraph．（动词短语后做宾补） 4） 说明：其实可以把第三句看成是由第一句的被动句。把宾语从句的主语Thomas Edison放在被动句的主语位置，谓语动词的意思就改为了“被认为”，既是：is / was generally considered。在这个动词短语后加上宾补have invented the first telegraph．时，前面要加上”to”.即是完整句：Thomas Edison is / was generally considered to have invented the first telegraph． 比较几个选项，答案是C．to have invented。 2“Clear the street ________ snow” is the same as “Clear the snow ________ the street”. A．of, from B．from, of C．off, away D．away, off
句意：把雪从街道上清理走。
解题思路：介词搭配。
解题过程：这是一个介词搭配的练习题。注意记好这个短语：clear A(被清理部位) of B（被清理物）= clear B（被清理物） from A（被清理部位）.如：Clear the table of dust = Clear dust from the table.
答案是： A．of, from。
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最终答案：略