题目内容
17．-The box is too heavy to carry．What's in it？-Oh，it __________ books．（ ）
| A． | is filled with | B． | is used for | C． | is aimed at |
分析 --那个盒子太重了搬不动．里面是什么？
--哦，里面装满了书．
解答 答案：A．
首先根据语境推测答语的句意是"哦，里面装满了书．"，句子表述的是现在的客观的事实，所以用一般现在时，主语it 是动作fill 的承受者，表示"被装满"所以用被动语态，一般现在时被动语态的构成是：主语+am/is/are+动词的过去分词，be used for"被用于…"；be aimed at"目的是…"都不符合语境，故选A．
点评 本题考查时态和语态．每个时态都有标志词，熟记这些标志词是做题的关键．在没有时间状语的情况下可以根据语境来对时态做出判断．判断语态的关键则是观察主语是谓语动词的执行者还是承受者．
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