Choose the word that completes the sentence: The chemistry lecture starts ___ nine o'clock every Sunday.
Answer and explanation
Correct answer: B. at
- Step 1: English uses at with clock times: at nine o'clock, at noon. Answer: at. Why not the others: On is used with days and dates, such as on Sunday, in is used with months, years and parts of the day, such as in the morning, and for is used with lengths of time, such as for two hours.
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