Is that the reason ______ at the meeting for his carelessness in his work? Actually we think he is a man who

is hard ______ himself especially in work. [ ]

A. that he explained to all; on

B. what he explained all; with

C. why he explained to all; at

D. which he explained to all; to

患儿，6个月。右睾丸未下降至阴囊内，查右阴囊空虚未触及睾丸，左侧发育正常。

该患儿手术中发现右睾丸发育极差，应采取的治疗是（）

A.右睾丸牵引固定

B.右睾丸切除+睾酮治疗

C.右睾丸牵引固定+睾酮治疗

D.右睾丸切除，如有斜疝行修补术

E.右睾丸牵引固定+绒毛膜促性腺激素治疗