-- Mr Smith ,What shall we do next?
-- Let students for discussion.
A. swept the floor
B. build the floor
C. open the floor
D. took the floor
网友回答
A. swept the floor
B. build the floor
(答案→)C. open the floor
D. took the floor
解析：考查固定短语。句意：--史密斯先生，我们接下来做什么？--让学生自由发言讨论吧。open the floor自由发言。故选C。