为你解答.
-When did you buy the bike?
-I have （ C.had） this bike for 5 years, but it still works well.
解释：要填能够延续的动词.bought（买）不能.
-Hurry up! They play （C.has been on） for 10 minutes .
解释：只有be on能够延续.
-She （A.has learned） English for 6 years.
解释：还是延续性的问题.
Although this village isn‘t big,all the other villages I （B.have visited） so far are smaller.
解释：完成时,表示“参观过的”.
This is the most beautiful moutain I have （A.ever） seen.
解释：ever表示“曾经做过”.
He has （B.never） been to shanghai,has he?
解释：因为疑问句部分是肯定,因此这里要填否定词.
I"ve never been seen such a fine picture （B.before）.
解释：before, 副词作时间状语“以前”.
So far,many countries (has improved) their environment.
His grandfather died two years ago.(同义句）
=His grandfather (has been dead) for two years.
My sister came here five years ago.(同义句）
=My sister (has been) here (since) ten years ago.
The film began 15 minutes ago.(同义句）
=The film (has been on) for 15 minutes.
=It (is) 15 minutes (since) the film (began).