企源知识库

（ ） you mentioned in your letter in connection with the question of agency has had our attention.
A、What
B、That
C、When
D、Which
【正确答案】：A
【题目解析】：本题考查what引导的主语从句。根据句意你所提出的······引起了我们的关注，此处应该选what。