作业帮since 时间的时态,什么时候用现在完成时,什么时候用现在完成进行时she_______in the elementary school since she graduated from college in 1990.a/ taught b/ has been teaching c/ was teaching d/ has taught
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since 时间的时态,什么时候用现在完成时,什么时候用现在完成进行时she_______in the elementary school since she graduated from college in 1990.a/ taught b/ has been teaching c/ was teaching d/ has taught
since 时间的时态,什么时候用现在完成时,什么时候用现在完成进行时
she_______in the elementary school since she graduated from college in 1990.
a/ taught b/ has been teaching c/ was teaching d/ has taught
since 时间的时态,什么时候用现在完成时,什么时候用现在完成进行时she_______in the elementary school since she graduated from college in 1990.a/ taught b/ has been teaching c/ was teaching d/ has taught
选择B吧.
现在完成时和现在完成进行时的区别：前者强调动作从过去持续到现在,而后者则不仅强调动作从过去不间断持续到现在,还包含将要继续持续下去的意思.如：It has rained for three days.（雨已经下了3天了）； It has been raining for 3 days.(可能继续下下去).
这一题与since没有很特别的联系.
听老师讲,一般来说,在单选题中,若have done 和have been doing同时出现,选后者多一些.
我所了解的就是这样,不知能否有所帮助.
从句，也就是since后面用过去，主句用现在完成或现在完成进行时
选b 现在还在教