The mother didn't know who      the glass because it happened when she was out.

A．break

B．has broken

C．had broken

D．breaks

门静脉癌栓的超声表现为（）

A.门静脉内单个或多个回声增高的结节，CDFI可见结节内有血供

B.门静脉内布满低至中等回声的实质性结构，有时充满整个门静脉

C.门静脉增宽明显，各段增宽程度不一致

D.门静脉血液可逆流，故癌栓可生长至脾静脉和肠系膜上静脉

E.以上说法均正确