问题补充：
—He should have come to join in the thorough cleaning.
—He . I don’t think it was his turn.
A. needn’t have to
B. needn’t have
C. didn’t have to
D. doesn’t need to
答案：
A. needn’t have to
B. needn’t have
(答案→)C. didn’t have to
D. doesn’t need to
解析：考查情态动词：句意：--他本应该参加大扫除的。--他不必，我想没有轮到他。A。needn’t have to表达不对，B.needn’t have是本不必做而做了，和句意不符合，D是现在不必，而这句话表示过去不必要，选C。
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