40．---It snowed heavily last night and there must be a lot of snow on Emei Mountain.

---No, we found a little snow, as most of it seemed ______ off the mountain.

　 　 A．to have blown　 　 　　　　　　　　　　　　　　　　 B．to have been blown 　　　　　　　　　　

　　　 C．to be blown　　　 　　　　　　　　　　　　　　 D．to be blown

39．______ is often the case, we have worked out the production plan.

　 　 A．Which　　　 　　　 B．When　　　　　　　　　 C．What 　　　　　　　　 D．As

38．There is no light in the dormitory．They must have gone to the lecture, ______?

　　　 A．didn’t they　　 　 B．don’t they　　　　　 C．mustn’t they　 　　 D．haven’t they

37．______, and the problem would be settled.

　 　 A．A bit more effort　　　　　 　　　　　　　 B．Having a little effort

　 　 C．If you have a bit more effort　　　　 D．There being a little effort