题目信息
After more than four decades of research and development, a new type of jet engine is being tested that could eventually propel aircraft anywhere in the world within two hours or help boost cargoes into space at significantly lower costs than current methods permit.
A:tested that could eventually propel aircraft anywhere in the world within two hours or help
B:tested that could eventually have the capability of propelling aircraft anywhere in the world within two hours or to help
C:tested, eventually able to propel aircraft anywhere in the world within two hours, or helping
D:tested, and it eventually could propel aircraft anywhere in the world within two hours or helping
E:tested, and it could eventually have the capability to propel aircraft anywhere in the world within two hours or help
参考答案及共享解析
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已选答案：
正确答案：
A:tested that could eventually propel aircraft anywhere in the world within two hours or help
选项分析:
A 正确，"that could eventually propel aircraft anywhere in the world within two or help"做定语修饰a new type of jet engine ；propel和help并列;
B could和have the capability of 重复，propering和to help不平行;
C propel和helping不平行;
D 改变句子重心（重心是测试）而且propel和helping不平行;
E could和have the capability of 重复，改变句子重心;
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