Question

【题目】________ every means _______ since then?

A. Did, try B. Have, tried C. Has, been tried D. Had, been tried

Answer 1

【答案】C

【解析】试题分析：句意：从那时起，每一种方法都被尝试。根据since then可知，本题用现在完成时，根据主语every means是单数可知，助动词用has。故选C。