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

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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

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 .

SAT语法 Piloted flights to Mars have not been planned (because have not been to 一道sat 语法the bus would not have had to take the long detour i i wonder if it is because i have not been able to be outdoor It is because I have not been able to be outdoors for so lon Because you have been around to accompany 1.All flights have been put off _______the fierce typhoon 英语翻译These extremely expensive flights into space have been p 改错题:All flights having been cancelled because of the storm,t Jerry planned to go to his subordinate because,--- 为什么Mars is not an easy place to live on而不是to live?求老师们详细的语法讲 You have not been to France,have you?的回答