问题标题:
need做实词和情态动词有什么区别Thestudentswereverygladthatthey_________theirpaperslastweekendastheteacherwasawayonvacation.C.needn'thavehandedinD.didn'tneedtohandinD.为什么选C不行?
问题描述:

need做实词和情态动词有什么区别

Thestudentswereverygladthatthey_________theirpaperslastweekendastheteacherwasawayonvacation.

C.needn'thavehandedinD.didn'tneedtohandin

D.

为什么选C不行?

陆大绚回答:
  选C的话就是虚拟语气了
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