Do you know what in the room at the moment?
A. they were doing
B. were they doing
C. they are doing
D. are they doing
网友回答
A. they were doing
B. were they doing
(答案→)C. they are doing
D. are they doing
解析：结合时间状语可知句意为：你知道此刻他们在房间内正做什么吗？结合语境可知从句描述的是现在正在进行的动作，故用现在进行时态。英语宾语从句一般为陈述语序。故选C。