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The workers ___ busily when the boss came to look for something she ___ in the office.
A．had worked; had leftB．were working; had leftC．working; had leftD．had worked; left
B
從句when the boss… 給出了內容是句子的重心, 主句用了過去進行時交代背景,因為從句和內容重要,這里的when譯成 “”這時”.
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