They usually do their homework _____8 o'clock ______night.(填介词)

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They usually do their homework _____8 o'clock ______night.(填介词)
They usually do their homework _____8 o'clock ______night.(填介词)

They usually do their homework _____8 o'clock ______night.(填介词)
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【答案】:at at
在具体的钟点前用at,表示几点整:at night是固定句型,表示在晚上.
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答案是at , at
时刻前用at
at night 是固定用法
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They usually do their homework __at___8 o'clock ___at___night.

at at
8 o' clock是时间点 前面+at
at night是固定搭配,
所以是at 8 o'clock at night

at; at
at 8 o'clock at night 在晚上八点

at, at 时刻前面都用at也就是时间点,at night是固定搭配

They usually do their homework __at___8 o'clock __at____night.

at;at
at用在具体时间点前;at night固定搭配