Question

关于英语完形填空一道问题！急！悬赏！

John，11 years old,was in bed in hospital．Several days before,while he was __16__in a baseball game, he fell and hit his head．The doctors believed that he might __17__get well.
“He seems to have given up hope. So medicines alone won’t __18__.Perhaps he needs something else,”said a doctor.“When I visit him,all he ever says is that he would like to meet Babe Ruth．”
To meet Babe Ruth，of course,was not __19__．In America,Babe Ruth was as __20__a man as the President himself,and he was the most famous baseball player．
The next day John’s father managed to tell Babe Ruth about the story of his son on the phone.Twenty-four hours later, as the boy __21__ in his hospital room,in walked __22__.Young John could hardlt believe his own eyes!
The great baseball player sat down at Jobn’s bedside,sang， “Now,listen，kid,you’ve got to get well. I’ve brought you a new American League baseball，__23___you must start throwing it．”
For John this was the beginning of a new life．__24__his doctors’surprise ,the boy walked out of the hospital on his own a few weeks later. How was able to live a healthy life---all beause of the___25__ of Babe Ruth．
16. A．looking B．playing C.taking D．sitting
17．A.never B.ever C．always D．certainly
18．A．fit B．make C．go D．do
19．A.easy B．1ucky C .difficult D．successful
20．A.strong B.important C．kind D。clever
21．A.waited B．1ied C.prepared D.lay
22．A.his father B．his doctor C．Babe Ruth D.the president
23．A．though B．because C．or D.so
24.A.In B．To C At D．For
25. A.story B．basketball C.present D．1ife

******18题为什么是D ？！求解！！！

Answer 1

So medicines alone won’t do 光是药物已经不起作用了

Answer 2

因为根据句意就是不可能会有帮助，而且do有解决的意思 所以选d

Answer 3

do还有 可用 的意思