This is the most interesting picture ______

试题详情及答案解析: This is the most interesting picture _______ I have seen.
A. that B. which C. what D how; 答案：A; 试题分析：句意：这是我曾经看过最有趣的图片。分析：考查定语从句的用法，先行词为picture, 先行词在从句中作为宾语，因此引导词可以用which或that, 但是，先行词被形容词的最高级所修饰，因此只能运用引导词that. 故选A
考点：考查定语从句的用法。