The sign on the right tells us taking photos here. A. is allowedB. isn’t allowedC. are al

问题补充：

The sign on the right tells us taking photos here.

A. is allowed

B. isn’t allowed

C. are allowed

D. aren’t allowed

答案：

A. is allowed

B. isn’t allowed

C. are allowed

D. aren’t allowed

解析：考查动词语态。。句意 右边的标示牌告诉我们，禁止照相。Allow doing sth 禁止做某事，考查这个短语的被动语态，并且doing做主语谓语动词用单数形式故选B 项。