if he -------- hard in thehe past five years,things wouldn't
if he -------- hard in thehe past five years,things wouldn't be going be going so smoothly.
a.had not been working b.was not working c.has not been working d.were not working
为什么选a 不选d
a.had not been working b.was not working c.has not been working d.were not working
为什么选a 不选d
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