1. —What are the ______ doing there? —They are busy ____________ their science experiment.
A.boysstudents,todoB.boystudents,todoC.boysstudents,doingD.boystudents,doing...
A. boys students, to do B. boy students, to do
C. boys students, doing D. boy students, doing 展开
C. boys students, doing D. boy students, doing 展开
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