—Yes, I have. I guess it ______ now.
A. has graded B. is graded C. is being graded D. is grading
分析:第一句中问对方有没有交作业,而第二句中回答是已经交了,并猜想“现在”这个“绝对点时间”上正在发生的动作(评分),所以它只能选用现在进行时,答案在C或D中选择(这儿还考到了被动语态的用法,作业是被评分,所以选D是不正确的,答案为C)。如下图所示:
现在进行时
now (is being graded)
③ 现在完成时是指到现在为止已经完成的动作或存在的状态,或者是过去某个动作对现在造成的影响,也就是说这个动作发生在过去,但一直持续到现在,或者说,发生在过去,对现在造成的影响,所以,它一般跟“段时间”状语连用,如:for a few seconds, for three week, since 1999, in the past(last) two years, ever since, by far, by now等。
例:The unemployment rate in this district ______ from 6% to 5% in the past two years. (2007 上海春)
A. has fallen B. had fallen C. is falling D. was falling
分析:本句中讲到这个地区的失业率在近二年从6%降到5%,近二年是指从二年前到现在,是一个“段时间”,与“现在”有关,所以它只能用现在完成时,答案为A。如下图所示:
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