题目内容
15．--Has Tommy finished his project yet？--Maybe not．He ___on it at lunch time．Let's go to have a look now．（ ）
| A． | has worked | B． | is working | C． | was working | D． | had worked |
分析 翻译：--Tommy已经完成了他的项目了吗？
--可能没有．午餐时间他正在做．咱们现在去看一看吧．
解答 答案：C．句中有at lunch time（午餐时间），说明了那时他正在做，又因为下句Let's go to have a look now．故句子用过去进行时态，过去进行时的构成：主语+was/were+动词的ing+…，句中主语是he，因此该用was，答案为was working，故选C．
点评 本题考查的是过去进行时，表示过去某个具体时刻正在进行的事情或动作．
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