— What ______ when the earthquake (地震) h
题型：选择题
问题：
— What ______ when the earthquake (地震) happened on May 12th?
— Er, I was having a geography class in the classroom. [ ]
A. are you doing
B. did you do
C. were you doing
— What ______ when the earthquake (地震) happened on May 12th?
— Er, I was having a geography class in the classroom. [ ]
A. are you doing
B. did you do
C. were you doing