He did not go to school yesterday because he______his father who was ill.

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问题 He did not go to school yesterday because he______his father who was ill.

选项 A、must have looked after
B、would have to look after
C、had to look after
D、should have looked after

答案C

解析 A项must+现在完成时,表示对已发生的事情的一种肯定的猜测。B项是过去将来时。D项should+完成时,表示应该做的事情而没有做。
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