The students _______ their homework carefully when the teacher walked into the classroom quietly.

A．do B．did
C．a(chǎn)re doing D．were doing

D

解析試題分析：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(shí)。根據(jù)when the teacher walked into the classroom quietly當(dāng)老師安靜地走進(jìn)教室時(shí)，可知學(xué)生們正在做某事，從句為一般過(guò)去時(shí)，主句為過(guò)去進(jìn)行時(shí)，故選D.
考點(diǎn)：考查過(guò)去進(jìn)行時(shí)

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