问题
选择题
----- _______ in the workshop. Please stop it.
----- Sorry. I________.
A．Smoking is not allowed, don’t know
B．Not smoking, an not sure
C．Don’t smoke, have no idea
D．Smoking is forbidden, didn’t know
答案
答案：D
"不知道" 是在对方告诉之前，故需过去时。