The students _______ their homework carefully when the teacher walked into the classroom quietly.
A．doB．did
C．a(chǎn)re doingD．were doing
D

試題分析：句意：學(xué)生們正在認(rèn)真做作業(yè)，當(dāng)老師安靜地走進(jìn)教室時。根據(jù)when the teacher walked into the classroom quietly當(dāng)老師安靜地走進(jìn)教室時，可知學(xué)生們正在做某事，從句為一般過去時，主句為過去進(jìn)行時，故選D.
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