世界卫生日相关资料:中小学三级考英语问题 请告诉我原因 39.29
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what's peter doing
he is doing his homework which he ___last night
a.ought to do
b.must have done
c.could be done
d.should have done
he is doing his homework which he ___last night
a.ought to do
b.must have done
c.could be done
d.should have done
“他在做应该昨天晚上就做完的作业”,所以,选d。