—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：考查英语中固定句型“cannot/can never be too...”。意为“越……越好”或“再……也不过分”，所以选B.。句意为“你越小心越好”。