动词时态：一般过去式

The sequence of events is, she went to the checkout, then realised she didn't have her purse. So 'was' and 'realised' are in the past simple. But she forgot to take her purse before that, when she left her house, so we use the past perfect for 'had forgotten'.

The answer to this quiz was (b) realised. Did you get it right?

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