SAT语法 Piloted flights to Mars have not been planned (because

问题描述：

SAT语法
Piloted flights to Mars have not been planned (because it requires) costly and complicated technology.
正确答案是because they would require
这里为什么不用will
1个回答 分类：综合 2014-11-07

问题解答：

我来补答
道理是：
- - - - because they would require costly and complicated technology if the plans were made
这是虚拟语气句子,省略了 if the plans were made .
 
 
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