★ Expressing Obligation and Modals
Choose the correct option to complete the sentences:
Companies ___________ look after existing customers carefully because it is expensive to get new customers.
A. need to
B. don’t have to
Preview next quiz:
A : I think I have problem with my teeth. B : You ….. see a dentist soon.
A. have to
B. should
C. has to
D. must
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