Every year, typhoons and losses lead to are frightening though measures have been taken.

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A. which
B. that
(答案→)C. they
D. ones
解析：本题定语从句的先行词是losses，后面定语从句的主语是they，they指代名词typhoon在句中做主语，在losses后面省略了that，that指代先行词losses作为动词短语lead to的宾语，可以省略。句义：每年，台风以及台风带来的损失都是很可怕的，尽管很多措施已经被采取了。故C正确。