请帮我选择下列5到选择题，一定要写解释：（1）Jim saw a woman ___near the door of the bank,so he thought she could be the

manager and he walked up to her. A.talked B.to sit C.writes D.standing (2)How did you work out this very ___physics problem last week,liz?-By___. A.easy;worked on my own B.difficulty;doing an experiment C.hard;ask my friends for help D.difficult;working with my deskmate (3)Sandy used to be shy and afraid to speak in public,but she has changed a lot this term,___？-Yes,she is quite confident now. A.wasn't B.isn't she C.hasn't she D.doesn't she 请一定要些解释！！

A DC

1.D:首先saw为感官动词，standing表状态。2D:由题意可知这道物理题很难，后句by加动词ing.则选D.3A,这是反问句，前面有used to be.可知是过去，又有be故选A