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单选题
______ to flow spontaneously from a block of ice to a surrounding volume of water, this could occur in complete accord with energy conservation.
A

There were energy    

B

There was energy

C

Were energy

D

If energy is


参考答案

参考解析
解析:
如果能量自然的从冰传递到周围的水中,这就与能量守恒定律完全吻合。由于句子后半部分采用过去式,故D项错误。前半句明显是一个条件状语从句,排除A、B两项,C项是倒装形式,原型是if energy were,故C项正确。
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