____ they ____ a cow yesterday?
A．Did; milkedB．Did; milkC．Do; milkedD．Do; milk
B

試題分析：句意：昨天他們給奶牛擠奶了嗎？結合語境可知本句描述的是過去的動作，故用一般過去時態(tài)，一般過去時態(tài)疑問句中一般用助動詞體現(xiàn)時態(tài)，行為動詞用原形，故選B。
點評：英語中的時態(tài)主要是借助于時間狀語與上下文語境來進行判斷。解答此類題型，首先要注意句子中的時間狀語，如果沒有則要通過分析上下文，結合語境來判斷句子的時態(tài)。英語疑問句中一般具有時態(tài)上的對應關系，注意結合這一特點進行區(qū)分。
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