问题详情：
More than 70,000,000 sharks ______ for their fins every year. It's really time for us to do something.
A. kill B. killed
C. are killed D. were killed
【回答】
C
【解析】
试题分析：句意：每年都有超过7千万头鲨鱼被杀以获得它们的鳍片。这是一个事实的描述，用一般现在时；该句应该是鲨鱼被杀害，因此是被动语态，所以选C
考点：考查动词时态。
知识点：动词语态
题型：选择题
