20、-- I called you at seven last night, but nobody answered．

-- Oh, I           in my workplace at that time．

A．a(chǎn)m working           B．was working          C．worked               D．had worked

20、B

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-- I called you at seven last night, but nobody answered．

-- Oh, I           in my workplace at that time．

A．a(chǎn)m working           B．was working          C．worked               D．had worked

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