问题补充：
—He should have come to join in the thorough cleaning.
—He , I think. Its not his turn.
A. needn have to
B. needn have
C. didn have to
D. doesn need to
答案：
A. needn have to
B. needn have
(答案→)C. didn have to
D. doesn need to
解析：“他本应该来参加大扫除的。”“他不需要来，没轮到他。”A项表示“本不需要来，但他来了。”D项时态不对。
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