China is no longer ( )it used to be.A.what B.that

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China is no longer ( )it used to be.A.what B.that
China is no longer ( )it used to be.A.what B.that

China is no longer ( )it used to be.A.what B.that
是选A.不过不是5楼所说的 what 做 主句的主语;而是what引导的句子 what it used to be 做主句的表语.what在从句中做从句中be的表语.
that在名词性从句(包括主语从句,宾语从句,表语从句和同位语从句)中没有意义,不做任何成分的,

A.

A

A

A
What既是主句的表语,也是从句的表语。
而that在从句中不做任何成分,只是引导词,

A。通常不用that来引导宾语从句而常用what

A