下列各组词语中，只有一个错别字的一组是（　　）

A．简捷推祟信口雌黄小人喻于利

B．坐谈蜡染骨梗在喉一言以蔽之

C．连锁捍卫张慌失措桃李不言,下自成溪

D．彩排度假既往不究学而不厌,晦人不倦

— It's said a pianist will perform at Poly Theater on Friday evening. Is it Lang Lang?

— Yes, it _______ him. He _______ for a week.

A．must be; has arrived here

B．maybe; has been here

C．must be; has been here

D．maybe; has arrived here