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I was at nine o’clock ______ I heard some terrible noises up

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I was at nine o’clock ______ I heard some terrible noises upstairs.
It was seven o’clock _______ I was standing under the Big Ben
I was at nine o’clock ______ I heard some terrible noises up
when 我听见楼上发出恐怖的声音时是9点 (后面用的是一般过去时)
while 7点时我正站在大本钟下.(后面用的是过去进行时)