英语问题!!!!!!急急急```

When he was in trouble,I was always doing what I could (do)to help him
这里to help him动词不定式做目的状语表示来帮助...
could 后省略了前面的相同动词do
翻译成:我总是做我所能做的来帮助他.(即尽我所能来帮助他)

选a

A.
could是情态动词，后面用动词原型。

A
could do

what I could 是名词性短语
do sth. to help him
所以选C

同意四楼的看法
确实what I could 是一个名词性短语,意思就是我所能做的事,从句子成分上来说,完全可以换成另一个名词,如something
I was always doing something to help him.
这个句子该明白吧,不要看前面是could就用动词原形,还应该看清楚句子成分