A-A+

Only outside the Earth's atmosphere ______ to

2022-08-01 21:04:10 问答库阅读 167 次

问题详情

Only outside the Earth"s atmosphere ______ to attain extremely high velocities.
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请帮忙给出正确答案和分析，谢谢！

参考答案

正确答案：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。