Question

Could you tell me ______ during Earth Hour on Mar.31st this

Answer 1

这是有宾语从句的疑问句,只能选 C：

A —— 在这种疑问句中从句不能倒装,用“where you were”才对；

B —— 时态不对,显然是问过去的事,要用“what you were doing.