问题描述：
need做实词和情态动词有什么区别
The students were very glad that they_________their papers last weekend as the teacher was away on vacation.
C.needn't have handed in D.didn't need to hand in
D .
为什么选 C 不行?
The students were very glad that they_________their papers last weekend as the teacher was away on vacation.
C.needn't have handed in D.didn't need to hand in
D .
为什么选 C 不行?
问题解答：
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