下列各句中，没有语病的一项是（ ）

55. I can’t see John anywhere. Where _____ he have gone?

the teacher’s advice yesterday, you __________in hospital now.

Tom _________ Mary in 1998. That is to say, they _________ for 12 years.

It will be one of the nations worst ________by climate change, as two fifths ofthe country isbelow sea level[ ]