问题
选择题
Nowadays signs prohibiting smoking a common sight in restaurants, tea houses and shopping malls．
A．are
B．is
C．were
D．was
答案
A
题目分析：考查动词。句意：现在，禁止吸烟的标志是在餐馆，茶馆，购物中心是非常常见。主语是signs标志，而prohibiting smoking是后置定语用来修饰signs,故选A项。
考点 : 考查动词