________ the classroom, the teacher found all the parents already______ there.
A．Entered; seatedB．Entering; seating
C．Entered; seatingD．Entering; seated
D
考查非謂語(yǔ)動(dòng)詞。第一空主語(yǔ)the teacher與Enter之間是主動(dòng)關(guān)系，故用現(xiàn)在分詞作狀語(yǔ)，第二空考查過(guò)去分詞作賓補(bǔ)，結(jié)構(gòu)為find sth done，句意：這位老師進(jìn)入教室，發(fā)現(xiàn)所有的老師已經(jīng)坐在那了。所以選D。
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