问题
选择题
__ we know, in a chemical change, energy cannot be created, ____.
A．Which, nor can it be destroyed
B．As, neither it can be destroyed
C．As, neither is it able to be destroyed
D．What, nor is destroyed
答案
答案：C
as we know 是常用句型，意为从所周知；neither是否定副词，放在句首，句子要用倒装。