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单选题
18.Some martian rock structures look strikingly like structures on Earth that are known（ ）by microbes.
A
A. having been created
B
B. being created
C
C. to have been created
D
D. to be created
答案解析
正确答案：C
解析：
空格所在的定语从句为 sth. be known to do 结构；that 指代地球上的岩石结构，与created 之间存在被动关系；当不定式动作发生在谓语动词的动作之前时，不定式需要用完成式。即：在人们知道之 前，岩石结构已经由微生物创造成，即 created 动作发生在 are known 之前，所以选择 to have beencreated。句意：一些火星的岩石结构看起来跟地球上的岩石结构极为类似。人们已知，地球上的岩石 结构是由微生物创造的。
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