[A]extension[B]retention[C]attention[D]exertion

[A] extension [B] retention [C] attention [D] exertion

正确答案：C
此题属于语意搭配题attention表示“注意力关注”原句意为：关注病人因此选项[C]attention正确选项[A]extension表示“延长扩充电话分机”；选项[B]retention表示“保持保留”例如：Theretentionofoldtechnologyhasslowedthecompany’sgrowth选项[D]exertion表示“尽力努力运用”例如：（1）Exertionofauthoritydoesnotcomeeasilytoeveryone．（2）Wewereallexhaustedafterourexertions