that's___ i've seen and hearda. what b.all which c.all what d. that all

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that''s___i''veseenandhearda.whatb.allwhichc.allwhatd.thatallthat''s___i''veseenandhearda.whatb.allwhich

that's___ i've seen and hearda. what b.all which c.all what d. that all
that's___ i've seen and heard
a. what b.all which c.all what d. that all

that's___ i've seen and hearda. what b.all which c.all what d. that all
选择A,不过不是LS所说的名词性从句,而是表语从句.整个what引导的从句作为主句is 的表语,而在从句中what作为seen and heard的宾语.
b和c应该改成all that就对了,不过就变成了定语从句了

选A, 这是个名词性从句,what在从句中做is的宾语。