2. 外语
  3. An earthquake is a shaking of the ground ______ when masses of rock beneath the surface of the earth change position.

An earthquake is a shaking of the ground ______ when masses of rock beneath the surface of the earth change position.

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问题 An earthquake is a shaking of the ground ______ when masses of rock beneath the surface of the earth change position.
选项 A、which occurring
B、it occurs
C、and therefore occurring
D、that occurs
答案D
解析 此处是that引导的定语从句，该句的意思为“地震是地面的一种震荡行为，它发生于地表下的物质要转换位置的时候”。
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