三个选项中的确只能选A what.
其中,what they can = what they can do,在句中做前面decided to do中do的宾语（从句）.
还是因为前面的那个do,所以该宾语从句中的do可以省略,以免重复.
其实还可以填入all, whatever或everything等.
英语句子疑惑The studebts decided to do_____ they can to help the p
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