-___I turn on the TV for you,Grandpa? -Yes,thanks-___I turn on the TV for you,Grandpa?-Yes,thanks a lot,my dear. You're so considerate. A. May B. shall C. Will D. Need答案是B,D为什么不对?

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-___I turn on the TV for you,Grandpa? -Yes,thanks-___I turn on the TV for you,Grandpa?-Yes,thanks a lot,my dear. You're so considerate. A. May    B. shall    C. Will    D. Need答案是B,D为什么不对?

-___I turn on the TV for you,Grandpa? -Yes,thanks-___I turn on the TV for you,Grandpa?-Yes,thanks a lot,my dear. You're so considerate. A. May B. shall C. Will D. Need答案是B,D为什么不对?
-___I turn on the TV for you,Grandpa? -Yes,thanks
-___I turn on the TV for you,Grandpa?
-Yes,thanks a lot,my dear. You're so considerate.
A. May B. shall C. Will D. Need
答案是B,D为什么不对?

-___I turn on the TV for you,Grandpa? -Yes,thanks-___I turn on the TV for you,Grandpa?-Yes,thanks a lot,my dear. You're so considerate. A. May B. shall C. Will D. Need答案是B,D为什么不对?
如果是D的话,应该是need to do sth,那么问句应该是Do I need to turn on.
这个是祈使问句,所以是B正确