Lily ,how to keep ourselves safe from the novel coronavirus?
All ____ we can do for the movement is to wear masks, wash hands frequently and exercise regularly.
选项有what that how,答案是that,为什么不能选what?
all在这里是代词作主语,后接定语从句,所以需要关系代词that引导定语从句。what引导的是名词性从句,不能作定语。
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