过去进行时的结构是:
A.was/were + doing
B.am/is/are + doing
C.did + do
D.will + do
A
A.was/were + doing
B.am/is/are + doing
C.did + do
D.will + do
A
题干 / 阅读材料
答案解析
过去进行时 = was/were + 现在分词,表过去某时正在做。
过去进行时的结构是: A.was/were + doing B.am/is/are + doing C.did + do D.will + do A 学习记录
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