All he could do was to take what seemed the best course at the present moment句子里的what是什么成分?修饰什么吗?

There was nothing else he could do.That was ____.A the whole B all （ ）was to take what seemed the best course at the present moment .A All he could do B All what he could do C What he can do D That he can do there was nothing else he could do.that was ___ 1 the whole 2 complete 3 every 4 all选择哪一个.为什么 He lost all his money when traveling long distance.The only thing he could do was _____ his wife为什么填call All he could do was to take what seemed the best course at the present moment句子里的what是什么成分?修饰什么吗? If selected,he promised he would do all he could▁▁pulic welfare.(promote) It was all she could do not to smack all of them. He told the _ that he was a good _ and could do something for them He was so e____ that he could do such hard work. why could he do me an injury when he was already saved my 关于“sympathetic”的问题请问“He was sympathetic,but he could do nothing.”和“He made sympathetic noises,but said he could do nothing to help.怎么区分? All I could do was to wait.So that's that All what she could do was to go back home.改错 翻译All I could do was that I lent you a dictionary. All what she could do was to go to church .中的错误在哪 I learned to laugh when all I could do was cry.”是什么意思? all I could do was long for you求翻译一下 The prisoner felt sorry for him,but there was nothing else he could do.there was nothing else he could do.是定语从句吗?