Whenyouseethesign,you
问题详情：
When you see the sign 
, you ________ take photos, for it is not allowed.
A. must B. have to C. must not D. don’t have to
【回答】
C
知识点：情态动词
题型：选择题
问题详情：
When you see the sign , you ________ take photos, for it is not allowed.
A. must B. have to C. must not D. don’t have to
【回答】
C
知识点：情态动词
题型：选择题
