—Must I turn off the gas after cooking?—Of course. You can never be careful with that.A. e

问题补充：

—Must I turn off the gas after cooking?

—Of course. You can never be careful with that.

A. enough

B. too

C. so

D. very

答案：

A. enough

(答案→)B. too

C. so

D. very

解析：can never be too…with（sth）意思是“对于（某事）怎么…也绝不过分”。