many trees are on __sides of the river.A each B both C all D every

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many trees are on __sides of the river.A each B both C all D every

many trees are on __sides of the river.A each B both C all D every
many trees are on __sides of the river.A each B both C all D every

many trees are on __sides of the river.A each B both C all D every
b

B
A用单数

当然是B了 :)
side用了复数的形式,AD就不对了
C是指两个以上的"所有"
B专指有两者的