--When __________you __________to cough?
--Two days ago.
A. do; begin   B. did ;began   C. did ;begin
C

試題分析：句意：你什么時(shí)候開始咳嗽的？——兩天前。結(jié)合語境可知上文描述的是過去發(fā)生的動(dòng)作，故用一般過去時(shí)態(tài)。當(dāng)句子中已有助動(dòng)詞體現(xiàn)時(shí)態(tài)時(shí)，行為動(dòng)詞用原形，故選C。
點(diǎn)評：英語中的時(shí)態(tài)主要是借助于時(shí)間狀語與上下文語境來進(jìn)行判斷。解答此類題型，首先要注意句子中的時(shí)間狀語，如果沒有則要通過分析上下文，結(jié)合語境來判斷句子的時(shí)態(tài)。
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