题目内容

“Not having returned home yet, _________”, his father said to the police.
A．his mother got worriedB．his mother must be worried
C．I think he is missingD．he must have got into some trouble.
D
句意：他的父亲对警察说：“还没回到家呢，他一定陷入了困境当中。must have done表示对过去事情肯定的推测。所以选D。
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