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The workers ________ busily when the boss came to look for s

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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
答案B
从句when the boss…给出的内容是句子的中心,主句用过去进行时交代背景,这时要意为“工人们正在忙着干活,就在这时老板回来了……”.