It was almost at eleven o'clock__ my father returned home last night A that Bwhen

选A,这是一个强调句It is.that.
把句子还原如果是一个完整的句子,就是强调句.
My father returned home at almost at eleven o'clock last night.
所以这个句子是强调句.什么是强调句在英文中，句子的主语、宾语、状语都可以写进一定的句式里以表示对它的强调。它们是: 1. It is / was 被强调的部分 that ( who, which ) 句子的其他部分, 2. What … is / was …这种句式就称为强调句。