B This statement indicates that the undeveloped airstrip near Greentown might be a better way to alleviate flight delays at Greentown, but it tells us nothing about the effects that converting the Hevelia airstrip to a full-service airport would have were it to be carried out.
it 指代this statement,也就是至题目的B选项,第二个it指代converting the Hevelia airstrip to a full-service airpot，意思就是 B选项这个陈述表明一个靠近G机场的未经开发的跑道可能是缓解G机场飞机延误的更好的办法（与在40英里外修建Hevelia跑道相比），但是这个陈述没有告诉我们任何把H跑道转变成全方位服务的机场后的结果.我觉得but后面的句子可能是but it tells us nothing about the effects that converting the Hevelia airstrip to a full-survice airport would have if it were carried out.作者: SharonZ0902 时间: 2012-12-19 06:51
to be carried out
怎么解释？
不是were carried out啊
不定式到底是修饰谁的作者: franciszmy 时间: 2012-12-20 07:04
were it to be carried out是 if it were to be carried out 的倒装 是个虚拟语气； were to是 is to的过去时，虚拟语气中is am 的过去时都用were
be to 是个固定搭配 表示将要 大致可以和will的意思相同
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