2. 外语
  3. Much of northern Canada lies within the Arctic Circle, and ______ ice or the sparse vegetation known as tundra.

Much of northern Canada lies within the Arctic Circle, and ______ ice or the sparse vegetation known as tundra.

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问题 Much of northern Canada lies within the Arctic Circle, and ______ ice or the sparse vegetation known as tundra.
选项 A、it is permanently covered by
B、by permanently it is covered
C、is permanently covered by it
D、it is covered by permanently
答案A
解析
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