Who______(study)in the room last night?I saw the light was on.

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Who______(study)in the room last night?I saw the light was on.

Who______(study)in the room last night?I saw the light was on.
Who______(study)in the room last night?I saw the light was on.

Who______(study)in the room last night?I saw the light was on.
就原形 study

因为有last night 昨天晚上,所以是过去时 填studied