Past continuous tense (过去进行时) 结构：was/were + doinge.g. 1.I was doing my homework at that time. 2. 莉莉进来时，他们正在看书。 Were reading books when Lily came in. They ________________
unit8 natural disasters(9)
2020-12-30 00:30
unit8 natural disasters(9).doc
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