The stones each as much as two tons.
A. weighs
B. are weighed
C. weigh
D. is weighed
网友回答
A. weighs
B. are weighed
(答案→)C. weigh
D. is weighed
解析：考查动词weigh的用法，和主谓一致，weigh表示“称重量”时是及物动词，做为“重达多少”时，是不及物动词，就是不能用被动。句意是：每块石头重达两吨。说明weigh是不及物动词，用主动，还有主语是The stones each时，谓语用复数，但是如果是each of…,谓语是单数。选C。
考点; 考查动词和主谓一致