I failed in the end ,though he tried everything he could __ meA to help B helped C help D helping

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Ifailedintheend,thoughhetriedeverythinghecould__meAtohelpBhelpedChelpDhelpingIfailedintheend,thoughh

I failed in the end ,though he tried everything he could __ meA to help B helped C help D helping
I failed in the end ,though he tried everything he could __ me
A to help B helped C help D helping

I failed in the end ,though he tried everything he could __ meA to help B helped C help D helping
选A
句意为尽管他已经做了所有他能做的来帮我.
he could是everything的定语 ,是嵌套在try to do 里的,所以help 的形式与could 无关

选A,try to do sth.

C
can后面只能跟动词原形