—Did Jack come back early last night?
—Yes. It was not yet eight o' clock          he arrived home
A．beforeB．thatC．whenD．until
C

試題分析：考查狀語從句：考生容易認為是在考查強調句。It be+被強調部分+that/who+其余部分。而判斷一個句子是否為強調句型，只需將其中的It is/was和who/that去掉，如果句子結構完整通順，則是強調句型，否則就可能是其他語法形式。如果選C項，去掉It was和所填的that后，時間狀語前缺少介詞，句法錯誤，因此該句不是強調句型，而是狀語從句。其次，認為是在考查it…before…句型。It is+時間段+before句型的肯定式表示“過多久……才、就”；否定式表示“不久……才、就”。此題如用before邏輯不符，這題是when引導的時間狀語從句，it指時間，句意為：-Jack昨晚回來得很早嗎？-是啊，當他到家時還不到8點。故答案選C。
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