[ Grammar & Vocabulary ]
The factory has been asked to respond ______ residents’ complaints about air pollution.
A. for
B. to
C. about
D. at
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Modals of Obligation and Permission › ViewMy father ……………………………… buy groceries for the family every day.
A. doesn’t need to
B. doesn’t have to
C. must
D. needs to
Grammar › View
If she ___________ the dentist earlier, she would not have lost her tooth.
A. visit
B. visited
C. had visited
D. have visited