．Mike didn’t notice Alice entering his room. He __________ a phone call.
A．a(chǎn)nsweredB．has answeredC．was answeringD．is answering
C
上文的語境已經(jīng)提示。過去進行時表示過去一個動作發(fā)生，另一個動作正在進行，過去進行時往往提供一個背景。
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