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
前一空表示當(dāng)時(shí)正在進(jìn)行的動(dòng)作，所以用過(guò)去進(jìn)行時(shí)，第二空用過(guò)去進(jìn)行時(shí)表示這動(dòng)作在came之前。
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