—I'm afraid I'll be too busy to go withyou.

—I'm afraid I'll be too busy to go withyou.
—Well,I'll keep a seat for you in case you____change your mind.A.can B.will C.should D.may答案选C可是will不也是表意愿吗?为什么不选will呢?
Lisa ___ not want to go on the trip___she hates traveling.A.will B.can C.must D.may 答案选D可是can在否定句里不也是表推测吗?为什么不选can
I took my driving lisense with me on holiday,____I wanted to hire a car.A.in case B.even if C.ever since D.if only答案选A可是in case不是介词短语吗?后面怎么能接句子呢?
Our friendship ____quickly over the weeks that followed.A.had developed B.was developing C.would develop D.developed答案选D可是over加一段时间不是要用完成时吗?