题目内容
The workers ___ busily when the boss came to look for something she ___ in the office.
A.had worked; had left B. were working; had left C. working; had left D. had worked; left
B
解析:
从句when the boss… 给出了内容是句子的重心, 主句用了过去进行时交代背景,因为从句和内容重要,这里的when译成 “”这时”.
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