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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

分析直到今天我們還沒有外太空是否存在生物的確切證據．

解答答案：D 題干中there are living creatures in outer space是修飾名詞evidence，解釋evidence的內容，是一個同位語從句；how表示方式，when表示時間，where表示地點，whether表示是否；句意表達的是不確定的內容，要用whether來引導．故選D．

點評同位語從句是名詞性從句的一種，用來解釋名詞的內容．學習時，要注意區分和定語從句的差別，定語從句是用來修飾名詞，同位語從句是用來解釋名詞的內容．

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