题目内容
9.Betty ___________ hard since last term.That's why her exam results are so good!( )| A. | has worked | B. | will work | C. | worked | D. | was working |
分析 贝蒂自从上学期就努力学习,那是为什么她考试成绩那么好的原因.
解答 答案:A.结合since last term可知动作发生在过去,对现在造成一定的影响,故用现在完成时have/has+过去分词,故选A,
点评 现在完成时有两种用法1.过去发生的某一动作对现在造成的影响或结果或到现在为止已经发生或完成的动作.2.表示过去发生的、持续到现在的动作或状态.
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