高中英语完成时---Have you been teaching here since graduation? ---No,I ____ farm for 5 years. A.worked B.have worked C.was working D,had worked为什么选A不选B?Cathy is taking notes of the grammatical rules i

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高中英语完成时---Have you been teaching here since graduation? ---No,I ____ farm for 5 years. A.worked B.have worked C.was working D,had worked为什么选A不选B?Cathy is taking notes of the grammatical rules i

高中英语完成时---Have you been teaching here since graduation? ---No,I ____ farm for 5 years. A.worked B.have worked C.was working D,had worked为什么选A不选B?Cathy is taking notes of the grammatical rules i
高中英语完成时
---Have you been teaching here since graduation? ---No,I ____ farm for 5 years.
A.worked B.have worked C.was working D,had worked
为什么选A不选B?
Cathy is taking notes of the grammatical rules in class at Sunshine School,where she ___English for a year.?
A.studies B.studied? C.is studying D.has been studying
为什么这个选D 如果把Cathy is换成 Cathy was 是不是选B呢?为什么?
谢谢了!

高中英语完成时---Have you been teaching here since graduation? ---No,I ____ farm for 5 years. A.worked B.have worked C.was working D,had worked为什么选A不选B?Cathy is taking notes of the grammatical rules i
1.一丝不是说在农场已经工作五年,他意思是毕业后没有教学,而过去五年在农场工作,强调过去式.现在完成时的话,说明现在还在农场工作,但事实是他在教学.明白了吗?这道题很值的琢磨.出的有水平.
2.说明事情正在进行,is taking,如果改成 took,后边就是studied,此句用的是现在完成进行时,她一直在学英语.换成was,就是had been studying,是过去完成进行时.

理解题意，“我在农场干了五年”言外之意是我没有一直教书，也就是他先在农场干了五年尔后才教书的
凯茜正在做笔记，是进行时，应该选现在完成进行时，如果是过去时应该选完成时态，因为后面有for a year

根据上下文，句意是只在这工作五年，而不是已经在这工作了五年。所以选A不选B
for+段时间是现在完成进行时的标志,选D
换了后不选B

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