题目内容
Mark Twain ______ school and began to work at the age of twelve.
| A．left | B．leaves | C．will leave | D．leave |
A
解析试题分析：句意：在十二岁的时候，马克吐温离开了学校，开始工作。结合语境可知本句描述的是过去某时发生的动作，故用一般过去时态，选A。
考点：时态
点评：英语中的时态主要是借助于时间状语与上下文语境来进行判断。解答此类题型，首先要注意句子中的时间状语，如果没有则要通过分析上下文，结合语境来判断句子的时态。英语疑问句中一般具有时态上的对应关系，注意结合这一特点进行区分。
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