there are many tree on [ ]side of the lake?A.both B.all C.either D.every湖好像不是两面的,好像是一面或者多面的,但是我忘了……老师的答案是either,好像不对.

there are many tree on [ ]side of the lake?A.both B.all C.either D.every湖好像不是两面的,好像是一面或者多面的,但是我忘了……老师的答案是either,好像不对.
there are many tree on [ ]side of the lake?A.both B.all C.either D.every
湖好像不是两面的,好像是一面或者多面的,但是我忘了……老师的答案是either,好像不对.

there are many tree on [ ]side of the lake?A.both B.all C.either D.every湖好像不是两面的,好像是一面或者多面的,但是我忘了……老师的答案是either,好像不对.
不要考虑有几面,而是side是单数,这种情况下只能用either.若是sides用both或者all都没啥事