41. During her study in Massachusetts Institute of Technology she has got the degree _____ PhD, and it is a degree ______ chemistry.
| A．of; at | B．in; at | C．of; in | D．in; of |
He had no sooner finished his speech________ the students started cheering.(2011·辽宁)
| A．since | B．as |
| C．when | D．than |
He smiled politely ________ Mary apologized for her drunken friends.(2012·山东)
| A．as | B．if | C．unless | D．though |
________ we have enough evidence，we can't win the case.
| A．Once | B．As long as | C．Unless | D．Since |
He is so busy.He cannot afford enough time with his son________he wants to.
| A．even if | B．as if | C．because | D．before |
I have heard a lot of good things about you ________ I came back from abroad.
| A．since | B．until | C．before | D．when |