When the teacher ______ how to do the experiment, the bell rang.
| A．explains | B．will explain | C．was explaining | D．is explaining |
試題分析：句意:當(dāng)老師正在解釋怎樣做這個(gè)實(shí)驗(yàn)的時(shí)候，鈴響了。在本題所給的情景中，the bell rang用的是一般過(guò)去時(shí)，由此我們知道這里說(shuō)的是一件過(guò)去的事情。且結(jié)合句意可知，是老師正在解釋的時(shí)候，鈴響了，故應(yīng)該用過(guò)去進(jìn)行時(shí)。Ａ選項(xiàng)為一般現(xiàn)在時(shí)；Ｂ選項(xiàng)為一般將來(lái)時(shí)；Ｄ選項(xiàng)為現(xiàn)在進(jìn)行時(shí)。
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