They . . . . . . . . . . . . . . . . hard all day?
A. shall work
B. worked
C. work
D. has been working
Answer: Option C
This Question Belongs to Competitive English >> Grammar
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Related Questions on Grammar
A. shall work
B. worked
C. work
D. has been working
Answer: Option C
This Question Belongs to Competitive English >> Grammar
Option B may also be the answer
I think all day includes present time. That's why we put present tense form.