题目内容
18．-I called you yesterday afternoon，but you were not at home．--Sorry，I _________ some shopping with my mother then．（ ）
| A． | is doing | B． | do | C． | was doing | D． | will do |
分析 --昨天下午我给你打电话，但你不在家．
--对不起，那时我正在和我妈妈一起购物．
解答 答案；C．
A为现在进行时，B为一般现在时，C为过去进行时，D为一般将来时． 根据问句"I called you yesterday afternoon"可知用的是一般过去时，答语出现"then"有"那时"的意思相当于at that time，即指打电话的那个时间点，过去进行时的定义：过去进行时主要表示过去某一时刻正在进行的动作，可知选过去进行时．过去进行时的构成：主语+were/was+doing，be本句主语是I，故选C．
点评 本题要求掌握过去进行时的定义及构成，选过去进行时的关键是看有没有表示过去的时间点．
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