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Scientists think that the continents __...

 Scientists think that the continents ______ always where they _______ today.

A. aren’t; are         B. aren’t; were            C. weren’t; are        D. weren’t; were

 

 C 【详解】考查考生对动词时态的掌握和运用能力。在think 引导的宾语从句里,where 引导表语从句,表语从句里有明显的时间状语today,所以用现在时态。本句的含义为“科学家认为大陆(以前)不在它们今天所处的位置。”
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