题目

挑战英语语法问题 被动语态
1.To understand the situation completely requires more thought than _____________________.
a.has given b.has been given c.had given d.had been given
为什么,请详解,该句比较级如何理解.
2.THe main stream of a river frequently _________ into two or more branches near its mouth.
a.divides b.is divided
为什么?难道我们上课经常说 the passage is divided into three paragraphs 一直是错的吗?
3.These minerals are known _____________ on the moon.
a.to have been collected b.to be collected
为什么,赶紧b也对呢

提问时间：2020-10-15

答案

1.than 引导的比较状语从句,有时也同时充当关系代词,因此从句中省略了主语,than的先行词thought为单数第三人称,因此从句的谓语动词用has been given.
2.divide既可做及物动词,又可做不及物动词,这里强调自然分开,非人为分开故用主动语态而不用被动语态.
3.答案应该是A,不是无中生有的C.用动词不定式的完成时态形式表示该动作早于谓语动词are known之前.