...ng D existed这里答案说选的是A ，因为than后面引导比较状语从句省略主语anxiety所以后面用谓语动词exists .那这样我认为over就应该是动词呀形成句与句之间的比较呀。anxiety over the perceived
risk of mountain climbing 与（anxiety）exists in the pub...
... that expanded the reach of science in innumerable directions中为什么of定语不只对use修饰，而是对the improvement and invention and use整体修饰，是因为the的原因吗？因为三个名词只有前一个有the。是这样吗？
先谢谢老师们了！
...吗？还有一个问题，如果两个时间状语放一起In February, when he went back, we got the answer we want.请问In February和when he went back是并列关系还是In February修饰后面when he went back, we get the answer we want.这个全句？一共是三个问题，谢谢老师!
...and between the turn of the 20th century and the eve of World War II, at a timewhen newsprint was dirt-cheap and stylish arts criticism was considered an ornament to the publications in which it appeared.为什么这里的同位语能够用介词短语表达呢？
... watch, he saw that it was one o'clock， but the bell struck thirteen times before it stopped.句中的 it stopped 用的是一般过去式, 在过去的过去应该用过去完成时，所以 strike 应该用过去完成时课时。新概念的作者的原文为什么表达 strike 这个动作...
(1) The decision (that) whether or not to salvage the wreck was not an easy one, although an excavation in 1978 had shown that it might be possible to raise the hull.(2) The hope that he may recover is faint.请问：是否可以认为 decision 后面省略了that？是同位语从句吗？