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
解析:考查have to用法。have to表示客观需要做的事情,意思是“必须”、“不得不”。后跟动词原形,有人称、时态和数的变化,其否定形式是在前面加助动词与not。与情态动词 must 近义,但他不是情态动词。句意:他应该来参加大扫除的。——我认为他不必来。今天不是他值日。结合语境可知下文描述的是过去的动作,故助动词用过去时态。选C。
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