题目内容
18.To live on Mars,you need to wear boots which ________ to prevent you from floating off into space.( )| A. | design | B. | designed | C. | are designing | D. | are designed |
分析 为了在火星上生存,你需要穿专门设计的防止你漂浮到太空的靴子.
解答 答案:D
根据主句是一般现在时,可知which引导的定语从句也用一般现在时,故该空处的时态是一般现在时,再根据关系代词which代替先行词boots在从句中作主语是谓语动词design的承受者,二者形成被动关系,故用被动语态,所以空处为一般现在时的被动语态,一般现在时的被动语态的结构为am/is/are+及物动词的过去分词,又根据定语从句谓语动词的单复数形式应与先行词一致,在本句中先行词是boots,为复数,所以是are designed,故选D.
点评 主要考查被动语态,当句子的主语是动作的承受者时,应该用被动语态,本题考查的是一般现在时态的被动语态.一定注意其构成形式,一般现在时的被动语态的构成:am/is/are+及物动词的过去分词,在本题中还要注意定语从句谓语动词的单复数形式应与先行词一致从而正确确定动词be的形式.
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