Two -thirds of that country ____by snow . A is covered B are covered

Two -thirds of that country ____by snow . A is covered B are covered
Two -thirds of that country ____by snow . A is covered B are covered

Two -thirds of that country ____by snow . A is covered B are covered
A is covered

B 之所以选择第二个，是因为Two -thirds（三分之二），不管后面跟的是可数还是不可数名词，如果是三分之一那就是用单数。（或者其他分之一也是用单数）

A