Question

---Must I turn off the gas after cooking ? 
---Of course . You can never be _______ careful with
that

1. A.
   enough
2. B.
   too
3. C.
   so
4. 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。