1.The river smells terrible.People must ______ dirty things into it .A be stopped from throwing B stop from throwing 2.He doesn't like to talk and won't speak unless _____ politely A speak to B spoken C speak D spoken to
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1.The river smells terrible.People must ______ dirty things into it .A be stopped from throwing B stop from throwing 2.He doesn't like to talk and won't speak unless _____ politely A speak to B spoken C speak D spoken to
1.The river smells terrible.People must ______ dirty things into it .
A be stopped from throwing
B stop from throwing
2.He doesn't like to talk and won't speak unless _____ politely
A speak to
B spoken
C speak
D spoken to
1.The river smells terrible.People must ______ dirty things into it .A be stopped from throwing B stop from throwing 2.He doesn't like to talk and won't speak unless _____ politely A speak to B spoken C speak D spoken to
1. A
翻译：这条河闻起来很臭.人们必须被禁止把脏东西扔进它里面去.
解释：固定短语stop sb from doing sth“阻止某人做某事”,变成被动即：sb be stopped from doing sth了.
此处的sb即people,而doing sth即throwing dirty things into it.
如果选B,则stop后面没有宾语.
2. D
翻译：他不喜欢交谈,如果没有被人礼貌说话,他就不会说.
解释：unless = if not“如果不”,而根据状语从句的省略语法（如果状语从句的主语和主句主语相同,且从句的谓语动词以be动词开始时,可以省略状语从句的主语和be动词）,则从句变化为：unless spoken to politely
= unless (he is) spoken to politely
= if (he is not) spoken to politely
而he is not spoken to politely为sb speak/speaks to him politely的被动结构,注意此时的介词to不能省略.
1.A 人们被阻止往河里扔脏东西，可能是被有关部门吧（这是个神秘的部门！）被动。
2.D 除非 对他说话客气些， 所以是被动。speak 后得有宾语,如 cang you speak English?这个English 就是宾语，没有的话得有介词。
1.be stopped from是一个被动语态，而人们并不是要在被动情况下才停止扔垃圾，这是一种倡导。所以应该要用stop from，选B
2.unless后加动词原形，排除BD
而speak to 后面不能加副词，所以只有C是正确的
第1小题应该选择答案A,因为这是一个由情态动词引导的被动语态结构,must后应用系动词be加动词的过去分词。
第2小题应该选择答案D，因为这也是被动语态，unless后省略了he is .
1.A be stopped from throwing （被阻止……）
2.D spoken to （被礼貌地……）
该两句的主语都是承接动作，都要用被动语态