A. have to pay your money if you cannot master a foreign language in 6 weeks.
B. needn’t pay your money if you cannot master a foreign language in 6 weeks.
C. must pay your money if you cannot master a foreign language in 6 weeks.
D. will be paid much money if you cannot master a foreign language in 6 weeks.
B
Dẫn chứng: Have you ever noticed advertisements which says “Learn a foreign language in 6 weeks, or your money back.
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