问题
选择题
Can you tell me ________ at that time?
A．what were they doing
B．what they were doing
C．what are they doing
D．what they are doing
答案
答案：B
考查宾语从句。宾语从句用陈述句语序。排除A、C；at that time指的是过去的时间，故用一般过去时，排除D。句意“你能告诉我那时他们在做什么吗？”故选B。