(单选题)
______in the arguments about the morality of artificially reproducing life is the fact that, at present, cloning is a very inefficient procedure.
A.Overlooked
B.Overlooking
C.Having overlooked
D.Having been overlook
参考答案:B
参考解析:
考查动名词作主语。句意:对人工复制生命的道德问题的辩论忽略了一个事实:当前,克隆本身是一个效率极低的过程。其一,整个句子的谓语动词是is,因此is前面为整个句子的主语,排除A。其二,根据句意可知不存在被动关系或先后关系,排除C和D。故选B。
知识点:
