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。