【題目】I have to go to bed ________ 8：30 p．m.________ school nights.

A. at；in B. at；on C. on；in D. on；on

【答案】B

【解析】句意：在上學(xué)日的晚上，我必須在晚上八點(diǎn)半上床睡覺(jué)。in/on/at介詞，都可作時(shí)間介詞，在。in常指在一段時(shí)間內(nèi)；on指具體到某天；at指具體的點(diǎn)刻。故選：B。

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