问题标题:
Theywereverytired,buttheywentonwiththeirwork.(保持原意)They_____working____theywereverytired.
问题描述:

Theywereverytired,buttheywentonwiththeirwork.(保持原意)

They_____working____theywereverytired.

李介谷回答:
  kept.though
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