安全生产的要素有()

A.安全生产文化

B.安全生产法制

C.安全生产责任制

D.安全生产科技

E.安全生产投入

——-We had a good time in dancing at a disco, why didn't you go with us?

——-I ________ there, but my parents didn't let me go.

A．couldn't go

B．failed to go

C．hadn't gone

D．would have gone