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Nadusha1986 [10]
3 years ago
6

Penelope ______ on her homework when the doorbell rang.

Social Studies
1 answer:
statuscvo [17]3 years ago
6 0
The correct answer is was working.
You need to use past continuous tense (was working) to denote that an action which was being processed for a period of time has now been interrupted. So, Penelope was working on her homework for a prolonged period of time, and then the doorbell rang and interrupted her. 
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