Two thirds of the forest ____ pine trees,which ___ at least three for four meters in height.

Two thirds of the forest ____ pine trees,which ___ at least three for four meters in height.

题目
Two thirds of the forest ____ pine trees,which ___ at least three for four meters in height.
a.are; are b.is; is c.is; are
选A,2/3的树林是松树怎么第一空用复数呢?
答案
这里并不是因为thirds,而是因为forest和people一样是一个集合名词.一般表示复数.One third of the forest后也要用are
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