All the club members the floor when they heard someone for help.
A. swept; were shouting
B. swept; shouted
C. were sweeping; shouting
D. were sweeping; shouted
网友回答
A. swept; were shouting
B. swept; shouted
(答案→)C. were sweeping; shouting
D. were sweeping; shouted
解析：此题考查过去进行时的基本构成和基本用法。