问题补充：
— He should have come to join in the thorough cleaning.
—He , I think. It’s not 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
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