Question

—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

Answer 1

B

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。