1、先看两题all的区别,1句中all做整个句子的宾语,它的前面的谓语动词是do；而2句中的all做整个句子的主语.
2、尽管先行词都是all,但1句中that是作从句的宾语（he could do that）,而2句中that是作从句的主语（that must be done）.理解了这一点也许你就明白了,因为引导词that等只有在从句中作宾语时才可以省略.
3、如此看来,2句中a后that不能省,c句整个主句缺少主语,d句不通.
1.The doctor did all ____ to save the wounded boy
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