-He is said to _____ continuously for 20 hours-No wonder he looks so tired@A.have been workingB.have workedC.workD.be working

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-He is said to _____ continuously for 20 hours-No wonder he looks so tired@A.have been workingB.have workedC.workD.be working
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-He is said to _____ continuously for 20 hours-No wonder he looks so tired@A.have been workingB.have workedC.workD.be working
-He is said to _____ continuously for 20 hours
-No wonder he looks so tired@
A.have been working
B.have worked
C.work
D.be working

-He is said to _____ continuously for 20 hours-No wonder he looks so tired@A.have been workingB.have workedC.workD.be working
A.have been working