The new program was being tested for errors at three o'clock yesterday. Or The new program was tested for errors at three c'clock yesterday. ) Here was being tested-past continuous- is more appropriate as there is a specific mention of the time- three o'clock and in case it had been just yesteday was tested- simple past- would have been correct The book was being translated at 4 o'clock.
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The new program was being tested for errors at three o'clock yesterday. Or The new program was tested for errors at three c'clock yesterday. (I chose the second sentence as correct.) Here was being tested-past continuous- is more appropriate as there is a specific mention of the time- three o'clock and in case it had been just yesteday was tested- simple