2. 外语
  3. In 1974 the space probe Mariner 10 discovered ______ Mercury’s surface is cratered by meteorite impacts.

In 1974 the space probe Mariner 10 discovered ______ Mercury’s surface is cratered by meteorite impacts.

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问题 In 1974 the space probe Mariner 10 discovered ______ Mercury’s surface is cratered by meteorite impacts.
选项 A、that the planet
B、of the planet
C、the planet that
D、which planet is
答案A
解析
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