问大家两个关于since和for的选择题My uncle has been living here for twenty years.用since把后三个单词改写成4个单词Marcia skated_____in last year's marathonA.for an hour B since one hour ago应该选什么?为什么选它?为什

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问大家两个关于since和for的选择题Myunclehasbeenlivingherefortwentyyears.用since把后三个单词改写成4个单词Marciaskated_____inlas

问大家两个关于since和for的选择题My uncle has been living here for twenty years.用since把后三个单词改写成4个单词Marcia skated_____in last year's marathonA.for an hour B since one hour ago应该选什么?为什么选它?为什
问大家两个关于since和for的选择题
My uncle has been living here for twenty years.用since把后三个单词改写成4个单词
Marcia skated_____in last year's marathon
A.for an hour B since one hour ago
应该选什么?为什么选它?为什么不选另一个?

问大家两个关于since和for的选择题My uncle has been living here for twenty years.用since把后三个单词改写成4个单词Marcia skated_____in last year's marathonA.for an hour B since one hour ago应该选什么?为什么选它?为什
My uncle has been living here since twenty years ago.
Marcia skated_____in last year's marathon
A. 玛西亚在去年的马拉松上滑了一个小时的冰.
不应选B,因为b意思是“自从一个小时前开始,一直持续到现在”,和句子的过去式及过去时间状语不一致.

since twenty years ago
选a 在去年的马拉松比赛中,marcia 滑了1个小时
b无法翻译

A 因为since 通常接从句,接短语时,意思是自从...以来,意思和这里的句子不符合

since twenty years ago
选A 在去年的马拉松比赛中,Marcia 滑了1个小时。
for可以用于一般过去时,since表示时间的时候只能与完成体连用。

My uncle has been living here for twenty years. 用since把后三个单词改写成4个单词
答:My uncle has been living here since twenty years ago.
My uncle has been living here since the year 1991.
Marcia ...

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My uncle has been living here for twenty years. 用since把后三个单词改写成4个单词
答:My uncle has been living here since twenty years ago.
My uncle has been living here since the year 1991.
Marcia skated_____in last year's marathon
A.for an hour B since one hour ago
应该选什么?为什么选它?为什么不选另一个?
答:A
析:因为since用现在完成时。for+一段时间 还可以用于过去时态。

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My uncle has been living here since twenty years ago .
choose A