The examination was continued a the begining of the new term,( ) was announced on January 29.A.what B.as C.which D.that 为什么?

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The examination was continued a the begining of the new term,( ) was announced on January 29.
A.what B.as C.which D.that 为什么?

这是非限定从 只能从B,C中看.
这里用as来引导时间状语从句,所以选B

首先排除AC,因为前面有(,),