：The retired worker resumed his task of servicing the buses without additional pay when he ________at home. A. could stay B. could have stayed C. can stay D. must have stayed

：The retired worker resumed his task of servicing the buses without additional pay when he ________at home.
A. could stay
B. could have stayed
C. can stay
D. must have stayed

出自：山西财经大学英语3

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