the old man was quietweak,so he_(must look after)适当形式填空

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the old man was quietweak,so he_(must look after)适当形式填空

the old man was quietweak,so he_(must look after)适当形式填空
the old man was quietweak,so he_(must look after)
适当形式填空

the old man was quietweak,so he_(must look after)适当形式填空
Must be looked after

must be looked after
老人相当虚弱,所以需要“被”照顾。

must be looked after
老人相当虚弱,所以需要“被”照顾。所以使用被动式。

must be looked after
老人相当虚弱,所以需要“被”照顾
be done表被动

must be looked after
必须被照顾

being