在時(shí)間狀語(yǔ)從句中的運(yùn)用：

例如一些引導(dǎo)詞 since, until, no sooner...than, hardly...when, scarcely...when 等，一般可視為 "had done" 出現(xiàn)的信號(hào),從句常用一般過(guò)去時(shí)。

No sooner had Whitney Houston began to sing a song than there was an instant sensation.

惠特妮·休斯頓一開始唱歌，就引起了瞬時(shí)的轟動(dòng)。(注意：這里由于no sooner 否定前置，句子謂語(yǔ)部分倒裝，所以”had”提前)

It was a long time since Darcy had lived in this city.

達(dá)西住在這座城市已經(jīng)有很長(zhǎng)時(shí)間了。(達(dá)西在過(guò)去的某個(gè)時(shí)間點(diǎn)之前就住在這座城市)

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