islimingintheclassroom?yes,inoticedhim___(go)intoitjustnow.
i'llgotothelibraryassoonasifinishwhati__
A.havedone
B.wasdoing
C.haddone
D.amdoing求答案和解释
islimingintheclassroom?yes,inoticedhim___(go)intoitjustnow.这也是一题,