In order to finish the research, the professor always _______, for every day the light in hisroom didn’t go out until 4 a.m.
A.mixed up | B.cleaned up | C.turned up | D.stayed up |
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In order to finish the research, the professor always _______, for every day the light in hisroom didn’t go out until 4 a.m.
A.mixed up | B.cleaned up | C.turned up | D.stayed up |