It was only when I fully understood the poem       to appreciate its beauty.

A．did I come

B．then I came

C．had I come

D．that I came

对多发性骨髓瘤诊断具有决定性意义的检查是

A．骨髓穿刺涂片形态学检查
B．外周血涂片检查
C．血沉测定
D．血清钙、磷和碱性磷酸酶测定
E．尿常规测定