A. However a serious problem

　　B. What a serious problem

　　C. However serious a problem

　　D. What serious a problem

　　〖2008全国Ⅰ〗The lawyer seldom wears anything other than a suit______the season.

　　A.whatever

　　B.wherever

　　C.whenever

　　D.however

　　什么情况下When是答案？

　　about to do…. When …

　　= be on the point of doing … when…

　　◆Was/were doing … when…

　　It was raining when we arrived.(指时间点)

　　〖2004上海Jasmine was holidaying with her family in a wildlife park _____ she was bitten on the leg by a lion.

　　A. when                B. while                

　　C. since              

　　D. once

　　When we were at school, we went to the library every day.(在一段时间内)

　　〖2007北京〗—Where’s that report?

　　—I brought it to you

　　you were in Mr. Black’s office yesterday.

　　A.if

　　B.when

　　C.because

　　D.before

　　◆Had just done… when…

　　hardly / scarcely … when…和no sooner … than …

　　〖2009福建〗She had just finished her homework

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