在易燃易爆化学危险品的生产现场，禁止穿（）以防止产生静电
A、S棉织物品
B、麻织物品
C、丝织物品
D、药纤织品
参考答案：D
Even though it is at least 20 years _____ we got to know, I can’t forget the scene_____ we were introduced to each other.
A．that , where
B．when, in which
C．since , when
D．since, where
渊源学
