Air, or ______ is called atmosphere, surrounds the whole earth.A、itB、thatC、whi

游客2025-02-28 25

问题 Air, or ______ is called atmosphere, surrounds the whole earth.

选项 A、it
B、that
C、which
D、what

答案 D

解析本题测试连词的用法。本句为主语从句，what在从句中做主语。

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