— Hello, I ____ to ask if I can book two tickets for tonight's film.

— sorry, we've already sold out.[ ]

A. phone

B. will phone

C. am phoning

D. have phoned

骨与关节结核在哪种情况下，适宜做病灶清除手术（）.

A.不能自行吸收的脓肿

B.长期不愈的窦道

C.有脊髓神经压迫症状

D.不易控制的单纯滑膜结核

E.合并肾结核