When the teacher ______ how to do the experiment, the bell rang.
A.explainsB.will explain C.was explainingD.is explaining
C

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用的是一般過去時(shí),由此我們知道這里說的是一件過去的事情。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)為一般將來時(shí);D選項(xiàng)為現(xiàn)在進(jìn)行時(shí)。
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