“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：他的父親對(duì)警察說(shuō)：“還沒(méi)回到家呢，他一定陷入了困境當(dāng)中。must have done表示對(duì)過(guò)去事情肯定的推測(cè)。所以選D。
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