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
参考答案
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更多大学英语单项选择题库试题
- 1The heavy rain _____, the students went on planting trees.
- 2No one can possibly recall any detail about the meeting．It is at least five years since it_.通常情况下since引导的句子后面用一般过去式
- 3John and I ____ friends for eight years.We first got to know each other at a Christmas party.But we _______ each other a couple of times before that.
- 4Mary is never late for class, _______ ?
- 5Here’s my card, Let’s keep in ___.
