The room (be on) ______ fire for five minutes when I got there.had been on本题考查动词

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问题 The room (be on) ______ fire for five minutes when I got there.

选项

答案 had been on

解析本题考查动词时态。for five minutes为一时间段，表明动作持续的时间，应用完成时。句中时间状语从句是一般过去时，主句的动作发生在从句之前，因此用过去完成时。

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