this is the place （） i studied ten yea

this is the place （） i studied ten yea
this is the place （） i studied ten years ago.A.where B.which C.that D.what 这道题选什么是不选A那为何不选C
where have you（）?the post office.A.gone to B.been to C.gone D.been 这道题选什么 原因?
Mr.Smith's story （） by everyone who heard it.A.laughed at B.laugh at C.was laughed at D.was laughed 答案以及为何不选D
my grandma bought a big birthday gift for（） A.both us B.we both C.us two D.we two 答案以及原因