绒毛结节性滑膜炎的临床表现包括

A．关节周围轻微疼痛和慢性肿胀

B．关节内有黄色渗液，含有大量胆固醇或血液

C．病损可恶变

D．多核巨细胞很常见，有的单核巨噬细胞吞噬脂肪成为泡沫细胞

E．手术切除后无复发

Please call my secretary to arrange a meeting this afternoon, or ________ it is convenient to you.[ ]

A. whenever  

B. however

C. whichever  

D. wherever