__ I need to do now is to study hard.A what B all C that Dwhich 选什么最好有理由

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__ I need to do now is to study hard.A what B all C that Dwhich 选什么最好有理由

__ I need to do now is to study hard.A what B all C that Dwhich 选什么最好有理由
__ I need to do now is to study hard.A what B all C that Dwhich 选什么最好有理由

__ I need to do now is to study hard.A what B all C that Dwhich 选什么最好有理由
A what
主语从句

选A what.
首先 What I need to do 是主语。
如果选B all的话,谓语通常用are,而不是is.
C和D可以直接排除。

选A,名词性从句。“What I need to do now is to study hard”我现在要做的是好好学习

选WHAT,引导主语从句。此处WHAT起到双重作用,从句中do的宾语,主句的主语,其他选项不能同时完成这两个作用的。