题目内容
17．I think the mountains will ______with trees in a few years'time．（ ）| A． | are covered | B． | be covered | C． | be covering | D． | be cover |
分析 我认为几年后山上将会被树覆盖．
解答 答案：B．主句是I think后加宾语从句，主句是一般现在时，从句结合 in a few years'time表达的是将来的动作，故用一般将来时，主语the mountains是动词cover的承受者，故用一般将来时的被动语态will+be+过去分词，故答案是B．
点评 被动语态（passive voice）是动词的一种形式，用以说明主语与谓语动词之间的关系．英语的语态共有两种：主动语态和被动语态．主动语态表示主语是动作的执行者，被动语态表示主语是动作的承受者．被动语态是动词的一种特殊形式，一般来说，只有需要动作对象的及物动词才有被动语态．汉语往往用"被"、"受"、"给"等被动词来表示被动意义．被动语态由"助动词be+及物动词的过去分词"构成．被动语态的时态变化只改变be的形式，过去分词部分不变．疑问式和否定式的变化也如此．
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