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

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

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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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