Unit12 Life is full of the unexpected.SectionB(1a-2f)I. 单项选择：（BC 层学生必做，A 层选做或不做）( )1. ---Scott, why didn't you come yesterday? ----I was going to, but I had ________unexpected visitor.A. aB. anC. theD.不填( )2.----Where is Carol? I can't find her in the classroom. ---Look...
