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It is not clear yet when the workers( )strike will return to their factories.
A. in
B. at
C. on
D. from
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A.DISC-REL-CLEARB.REL-DISC-CLEARC.CLEAR-REL-DISCD.CLEAR-DISC-REL
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A.When-Mouse-UpB.When-Mouse-MoveC.When-Mouse-DownD.When-Mouse-ClickE.When-Mouse-Leave
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