The seminar will adjourn ______ five o’clock.A、inB、onC、atD、the CAt is the co

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问题 The seminar will adjourn ______ five o’clock.

选项 A、in
B、on
C、at
D、the

答案 C

解析 At is the correct preposition for a specific time. Choice (A) means during (or at the end of) a period of time. Choice (B) is incorrect for a specific time. Choice (D) is an article.  
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