英语 情态动词1.Marketing is not as important for high street retai

英语 情态动词1.Marketing is not as important for high street retailers as for online retailers,and you _______ spend less on advertising than online retailer.A.mustn’t B.need to C.don’t have to2.Training staff to deal with customers in your shops is very important.They __________ learn to be helpful to customers.A.should B.need to C.mustn’t3.Staff __________ also have good technical knowledge of the products they sell so as to be able to answer customers’ questions.A.should B.needn’t C.must4.Products __________ be presented attractively if you want people to buy them.A.must B.need to C.shouldn’t5.Unlike online retailers,you __________ keep large stocks of goods in your shops.A.must B.needn’t C.don’t have to】