问题
选择题
—How long have you been going to work on foot?
—Since last month when I ________ from a heart attack.
A．recovered
B．have recovered
C．was recovering
D．would recover
答案
答案：A
A 考察动词时态。句义：你步行上班已经多长时间了？—自上个月我心脏病康复开始。Last month是时间点，应该与过去时连用。故A正确。