问题描述：
-Where is Tom?
-He hasn‘t come to school today.I think he （ has gone to ）hospital because he is ill.
gone to ,我想问为什么不能是 has been in】
There are many tall trees on （C.both）sides of the river.
A.each B.every C.both D.either
【为什么要选C,不理解】
-He hasn‘t come to school today.I think he （ has gone to ）hospital because he is ill.
gone to ,我想问为什么不能是 has been in】
There are many tall trees on （C.both）sides of the river.
A.each B.every C.both D.either
【为什么要选C,不理解】
问题解答：
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