我是一高三生,英语学得不好,这是平时做的一些语法练习,不好意思求助老师,

我是一高三生,英语学得不好,这是平时做的一些语法练习,不好意思求助老师,
时态语态 ：3.The old woman who — in the deserted house alone for the years as been settled in a nursing home now .
A.lived B.C.D.has been living 为什么选A不选D
27.Tom,who—?—.on the Olympic Committee all life,is retiring next month.
A.served B...C...D.has served
为什么选D不选A
32.—Have you seen the film?
—Yes.I __ it three times when I was in America.
A.saw B.had seen .
为什么选A不选B