非谓语英语问题

题目

非谓语英语问题
C19 ._____ for a long time,most of the crops in this area died from lacking water.
A.Being no rain B.There was no rain
C.To be no rain D.There being no rain
为什么选C,A和C如何辨析
C23 .Charles Babbage is generally considered ____ the first computer .
A .to invent B .inventing C .to have invented D .having invented
为什么选C,不选D

答案

19.选c 是错误的,不定式做状语一般表示目的或结果.这句显然是表原因：因为很久没有下雨,.
所以要选D.用一个独立主格结构,表原因.
23.consider 有两个意思：认为,考虑.consider doing sth.也就是consider 后接doing形式 时,是“考虑”的意思.be considered to.do sth.被认为..这句就是这个意思.