2. 外语
  3. Some Martian rock structures look strikingly like structures on Earth that are known____by microbes. (2017-18)

Some Martian rock structures look strikingly like structures on Earth that are known____by microbes. (2017-18)

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问题 Some Martian rock structures look strikingly like structures on Earth that are known____by microbes. (2017-18)
选项 A、having been created
B、being created
C、to have been created
D、to be created
答案C
解析 考查不定式。be said／reported／believed／thought／known／reported后面可以接to do表示“将要做”，接be doing表示“正在做”，接have done意为“已经做完某事”。原句中are known后面接不定式是固定搭配，故排除选项A和B。因为微生物创造形成结构这一动作已经完成，时态用完成时，排除D。逻辑主语“结构”和动词“创造”是被动的关系，故本题答案为C。
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