动词的过去进行时
过去进行时主要表示过去某个时刻或一段时间内正在进行的动作。
过去进行时的谓语形式：was / were + 现在分词。
My son was practicing the piano this time yesterday evening.
When I called him, he was having his breakfast.
While we were having a meeting, Mary came in and told us the terrible news.
I was leaving the room when the telephone rang.
1. James has just arrived, but I didn't know he _____ until yesterday.
A. will come B. was coming C. had been coming D. comes
现在完成时表明的是过去的动作对现在的影响或持续到现在。
had been过去完成时，表示过去的过去。
was coming用过去进行时表示将要的动作。
答案 B
2. "What were you doing when Anna phoned you?"
"I had just finished my work and _______ to take a bath.'
A. starting B. to start C. have started D. was starting
what were you doing提问的是过去进行时。
答案 D
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