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 |
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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 |