Scientists think that the continents ____ always where they ___today.
A．a(chǎn)ren't; areB．a(chǎn)ren't; wereC．weren't; areD．weren't; were
C
由關(guān)鍵詞：today看出前后對(duì)比，時(shí)態(tài)也要用現(xiàn)在和過(guò)去對(duì)比。
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