The workers _____ busily when the boss came to look for something he _____

The workers _____ busily when the boss came to look for something he ______ in the office.

A．had worked, had left

B．were working ; had left

C．working ; had left

D．had worked; left

【考点】过去进行时,过去完成时,语法一致原则

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难度：较易

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