that was () surprised all of usa.which b.what要原因

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that was () surprised all of usa.which b.what要原因

that was () surprised all of usa.which b.what要原因
that was () surprised all of us
a.which b.what
要原因

that was () surprised all of usa.which b.what要原因
That was WHAT surprised all of us --------没有指代,就用what.
==That was SOMETHING THAT surprised all of us -------如果有了something,就用that指代.
== 比如说:That was Tom's decision THAT / WHICH surprised all of us -------that / which指代Tom's decision.

B ……的人/东西/地方

B what在表语从句中作主语

B
表语从句,后面的的从句那缺少主语,,而which 不可以代替主语只能用what

两个答案都不通
可以勉强用 b what

a