Mr. Brown is very rich. He_____ work hard for a living.
A. mustn't
B. shouldn't
C. can't
D. doesn't have to
KEY: D
Giải thích: Vì vế trước có thông tin Mr. Brown rất giàu, nên có thể suy ra pông ấy không cần thiết (doesn;t have to) làm việc quá vất vả.
Dịch: Ngài Brown rất giàu có. Ông ấy không cần làm việc vất vả để kiếm sống.
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