quEstions 17～20 ArE BAsED on thE Following DiAloguE ABout A BArgAin. you now hAvE 20 sEConDs to rEAD quEstions 17～20. ACCorDing to thE womAn, whAt shoulD thE mAn hAvE DonE
A、hE shoulD hAvE ChECkED thE priCEs oF DiFFErEnt rECorDErs BEForE Buying onE.
B、hE shoulD hAvE tEstED thE rECorDEr BEForE lEAving thE storE.
C、hE shoulD hAvE kEpt thE rECEipt wEll.
D、hE shoulD not hAvE gonE to thE shop.