Hydrogen, which is ______ than oil, is pretty easy to produce and does no harm to the environment.
A、
much energy more abundant source
B、
an energy source more abundant
C、
a much more energy abundant source
D、
a much more abundant energy source
【正确答案】
D
【答案解析】
energy source意为“能源”，此名词词组前用abundant修饰，表示“丰富的能源”。abundant前又由比较级much more修饰，从而与空格后的than呼应，因此答案为D。
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