It is an open secret _____he is not a qualified manager.

选择一项：
A. that
B. which
C. what

答案：A 译文：他不是个称职的经理，这是个公开的秘密。 解析：it作为形式主语，真正的主语为he is not a qualified manager，因此用连接词that引导，选A。 正确答案是：that