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(单选题) Scientists think that the continents ______ always where they ____today. ( )(本题2.5分)
A、 aren’t;are
B、 aren’t;were
C、 weren’t;are
D、 weren’t; were
A、 aren’t;are
B、 aren’t;were
C、 weren’t;are
D、 weren’t; were
参考答案