题目内容
13．-Did Billy and Anna find a way out at last？-Yes，they _____ a plan and did it．（ ）
| A． | were working out | B． | worked out | ||
| C． | are working out | D． | have worked out |
分析 --Bill和Anna最后找到办法了吗？
--是的，他们制定了一个计划并且实施了．
解答 答案：B．
根据问句中的助动词did和答语中的and did it判断设空处所在的句子用一般过去时．句意是"他们制定了一个计划并且实施了．"一般过去时的构成是：主语+动词的过去式； 故答案为B．
点评 本题考查了动词的时态．做题时，一定要特别关注有关的时间短语，这是判断句子时态的标志．在没有时间状语的情况下可以联系上下文根据语境来做出正确判断．
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