【題目】—________did the rainstorm come, Mr. Liu?

—While we ________ a chemistry lesson yesterday afternoon.

A.When; have hadB.When; were havingC.While; are havingD.While; have

【答案】B

【解析】

句意：——劉老師，暴風(fēng)雨什么時(shí)候來的？——昨天下午我們正在上化學(xué)課的時(shí)候。

考查when和while的區(qū)別以及動(dòng)詞的時(shí)態(tài)。When什么時(shí)候；have had現(xiàn)在完成時(shí)；were having過去進(jìn)行時(shí)；While在……期間；are having現(xiàn)在進(jìn)行時(shí)；have一般現(xiàn)在時(shí)。根據(jù)句意可知，問句提問的是暴風(fēng)雨到來的時(shí)間，并且問句的動(dòng)詞come是短暫性動(dòng)詞，而while引導(dǎo)的從句中的動(dòng)詞必須是延續(xù)性動(dòng)詞，所以第一空用特殊疑問詞when，排除選項(xiàng)C和D。根據(jù)答句的句意和yesterday afternoon可知，第二空應(yīng)該用與過去相關(guān)的時(shí)態(tài)，故選B。

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