—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
网友回答
A. enough
(答案→)B. too
C. so
D. very
解析：can / could not...too是一个固定搭配，表示“无论怎样也不过分；此句话的汉语意思是：－做完饭后一定要把煤气关掉吗？－当然，你越小心越好。有些学生误认为can never be too…是一个孤立的结构，而逐字翻译，从而误选D。