—Can you tell me if Tom has finished his homework?
—I've no idea. He ________ it this morning.
A．has being doingB．had done
C．is doingD．was doing
D
答案：D　考查動(dòng)詞時(shí)態(tài)。句意為：——你能告訴我Tom是否完成家庭作業(yè)了？——我不知道。今天早上他正在做。根據(jù)答語(yǔ)可知，做作業(yè)的動(dòng)作發(fā)生在過(guò)去，強(qiáng)調(diào)的是當(dāng)時(shí)的動(dòng)作正在進(jìn)行，因此用過(guò)去進(jìn)行時(shí)。故D項(xiàng)正確。
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