The postman noticed that two men,carring______looked like guns,enterd the bank.A.that B.something C.which D.what请问为什么不能选B.

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The postman noticed that two men,carring______looked like guns,enterd the bank.
A.that B.something C.which D.what
请问为什么不能选B.

这是因为carrying后引导的宾语从句既差一个连接词又要做looked like guns的主语,所以只能用what