题目内容
10．I this book for a week．I have to return it now．（ ）| A． | borrow | B． | have borrowed | C． | have kept |
分析 这本书我已经借了一个星期了．我现在必须还上了．
解答 答案：C．
句中的时间状语for+时间段是现在完成时的标志，且句子中的谓语动词必须是延续性动词，现在完成时的构成是：主语+have/has+动词的过去分词；主语是I，助动词用have，borrow是非延续性动词，不能与时间段连用，keep是一个延续性动词，可以与时间段连用，故选C．
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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