请NN解释一下这两个GWD-18-Q11和GWD-12-Q19的选项？

 GWD-18-Q11

In no other historical sighting did Halley’s comet cause such a worldwide sensation as did its return in 1910-1911.

A.      did its return in 1910-1911

B.       had its 1910-1911 return

C.      in its return of 1910-1911

D.      its return of 1910-1911 did

E.       its return in 1910-1911

正确为c

255.
   (29858-!-item-!-188;#058&004408)     (GWD-12-Q19)

Heavy commitment by an executive to a course of action, especially if it has worked well in the past, makes it likely to miss signs of incipient trouble or misinterpret them when they do appear.

A. Heavy commitment by an executive to a course of action, especially if it has worked well in the past, makes it likely to miss signs of incipient trouble or misinterpret them when they do appear.

B. An executive who is heavily committed to a course of action, especially one that worked well in the past, makes missing signs of incipient trouble or misinterpreting ones likely when they do appear.

C. An executive who is heavily committed to a course of action is likely to miss or misinterpret signs of incipient trouble when they do appear, especially if it has worked well in the past.

D. Executives’ being heavily committed to a course of action, especially if it has worked well in the past, makes them likely to miss signs of incipient trouble or misinterpreting them when they do appear.

E. Being heavily committed to a course of action, especially one that has worked well in the past, is likely to make an executive miss signs of incipient trouble or misinterpret them when they do appear.

C or E?

为什么没人解答，真的很难吗？

第一题选A,第二题选C.

第一题,as前后对称.

第二题,E的is likely to主语不对