Professor Huang ,together with his assistants ,__hard in the lab now to make up for the losttime .A.work B.is working C.works D.are working

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Professor Huang ,together with his assistants ,__hard in the lab now to make up for the losttime .A.work B.is working C.works D.are working
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Professor Huang ,together with his assistants ,__hard in the lab now to make up for the losttime .A.work B.is working C.works D.are working
Professor Huang ,together with his assistants ,__hard in the lab now to make up for the lost
time .A.work B.is working C.works D.are working

Professor Huang ,together with his assistants ,__hard in the lab now to make up for the losttime .A.work B.is working C.works D.are working
B