_______ puzzles me most is that I don’t know _______ the difference between those two lies.

A．What; that

B．It; that

C．What; where

D．It; where

女性，45岁，胃癌术后2年，现发现双侧卵巢对称性增大，直径10cm，卵巢保持固有外形，表面光滑，切面实性，灰白色，质硬。

Krukenberg瘤最常见的原发灶是

A．大肠
B．胃
C．乳腺
D．小肠
E．阑尾