He asked me what ___ in China in 1976.

问题描述:

He asked me what ___ in China in 1976.
横线上填 happened 还是 had happened
说下原因.

HAD HAPPENED
HE ASKED ME 已经是过去时态
他问的是1976的中国发生了什么?
所以谓语在“1976的中国”是处于过去的过去时态,因而用HAD HAPPENED!