A rocket does not depend on the atmosphere for its propulsion, but ______in the

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问题 A rocket does not depend on the atmosphere for its propulsion, but ______in the absence of an atmosphere because of lessened air resistance.

选项 A、would actually perform better
B、perform better
C、performed better
D、have had performed better

答案 A

解析虚拟语气题。虚拟语气以非真实条件句为代表。本题属于含蓄条件句，同样引出非真实情况，即in the absence of an atmosphere表示虚拟的条件，与客观事实相反，而选项相当于主句的谓语，应使用would do形式，故本题答案为A。

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