The old lady was so pleased with all ______ we had done for her ______ she wrote us a thank-you letter.

A．what; that

B．that; that

C．which; that

D．that; what

下列疾病中，超声检查是首选且可靠性最高的是（）。

A.肝血管瘤

B.肝腺瘤

C.肝囊肿

D.肝内转移灶

E.炎性假瘤