—How long have you been going to work on foot?
—Since last month when I ________ from a heart attack.
A．recoveredB．have recovered
C．was recoveringD．would recover
A
A 考察動(dòng)詞時(shí)態(tài)。句義：你步行上班已經(jīng)多長時(shí)間了？—自上個(gè)月我心臟病康復(fù)開始。Last month是時(shí)間點(diǎn)，應(yīng)該與過去時(shí)連用。故A正確。
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