Only outside the Earth’s atmosphere ______ to attain extremely high velocities.

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问题 Only outside the Earth’s atmosphere ______ to attain extremely high velocities.

选项 A、to be safe for a space vessel
B、is safe for a space vessel
C、for a space vessel to be safe
D、a space vessel to be safe

答案B

解析 only为含有否定意义的副词，位于句首时谓语要部分倒装，而且只有B选项含有谓语动词。

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A类竞赛（研究生）

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