This firm, forced to leave the Chinese market, has not kept the written promise _______ made before.[ ]

A. that

B. this

C. it

D. one

甲状腺癌超声表现为（）

A.甲状腺内结节边界模糊，不规整，结节周围无正常甲状腺组织

B.肿瘤单发，圆形，边界清，有包膜，周边有晕环

C.肿瘤边界不规整呈蟹足样改变，肿块呈低回声伴砂粒体钙化

D.弥漫性甲状腺肿大回声无改变

E.甲状腺内可见多个无回声区