15. A challenging new area in inorganic chemistry is ---- the role of transition metals in the biochemical catalysts called enzymes. (A) that of understanding (B) to have understanding (C) the understanding (D) understanding that
到底应该选什么?如果是A的话,that (引导定语从句)后面不是应该接不完整句吗?
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句子的主语是:一个在无机化学领域具有挑战性的新领域 谓语是:is
用排排除法: d,understanding后面直接跟宾语,不加that
c,the understanding和the role中间没有连词,错误
b,主语是领域,不能去to have understanding,错
a,这里的that不是定语从句,指代后面的部分,正确.
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