Question

英语现在完成时练习

1.we_____jim since she was a little girl.
A.know B.had known c .have known D.knew
答案；C. 有was为什么不是B.
2.His father_____the party since 1978
A.joind B.has joined C.was in D.has been in
答案；D. B为什么不可以？？？
3.his uncle_____for more than 9 years
A.has come here B.has started to work C.has lived there D.has left the university
答案；C. 一定么???

ps;每题后面有我提的问题，给解答了！！！

Answer 1

现在完成时是动作发生在过去，状友袭态持续到现在或对现在的影响。since表示自从……（后面常接一个一般过去时）。切记现祥告扰在完成时不能与瞬间动词连用，如可谨旦以说You have been in the army since last year. 但不能说You have joined the army since last year.
过去完成时即过去的过去，强调对过去的影响。
1.we_____jim since she was a little girl.A.know B.had known c .have known D.knew
强调自从她是小女孩以来（表过去时间），我们就认识Jim(强调对现在的影响，即现在还认识）
2. 理由见上。
3. ABD均为瞬间动词，不能与时间段连用，C正确。