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The students _______ their homework carefully when the teacher walked into the classroom quietly.
A．doB．did
C．are doingD．were doing
D

試題分析：句意：學生們正在認真做作業，當老師安靜地走進教室時。根據when the teacher walked into the classroom quietly當老師安靜地走進教室時，可知學生們正在做某事，從句為一般過去時，主句為過去進行時，故選D.
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