But don’t think there is nothing else you can do the interview is over. You should write

问题补充：

But don’t think there is nothing else you can do the interview is over. You should write to the company to thank them for giving you the interview.

A. if

B. once

C. when

D. though

答案：

A. if

(答案→)B. once

C. when

D. though

解析：考查连词辨析。一旦面试结束，不要以为没有其他事情可做了。你应该写信给公司感激他们给你面试的机会。故答案为：once。