Even today we still have no solid evidence there are living creatures in outer space．( )A．howB．whenC．whereD．whether 题目和参考答案——青夏教育精英家教网—

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5．Even today we still have no solid evidence ________ there are living creatures in outer space．（　　）

A．

how

B．

when

C．

where

D．

whether

分析直到今天我们还没有外太空是否存在生物的确切证据．

解答答案：D 题干中there are living creatures in outer space是修饰名词evidence，解释evidence的内容，是一个同位语从句；how表示方式，when表示时间，where表示地点，whether表示是否；句意表达的是不确定的内容，要用whether来引导．故选D．

点评同位语从句是名词性从句的一种，用来解释名词的内容．学习时，要注意区分和定语从句的差别，定语从句是用来修饰名词，同位语从句是用来解释名词的内容．

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