问题
选择题
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
答案
答案：C
由关键词：today看出前后对比，时态也要用现在和过去对比。
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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
答案：C
由关键词：today看出前后对比，时态也要用现在和过去对比。