---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 hereB.maybe; has been hereC.must be; has been hereD.maybe; has arrived here
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C解析考查情态动词和延续性动词的用法。第一空表示很有把握的推测，用情态动词must加be，may be 表示可能性小的推测，但是却不能用maybe，因为maybe是副词，而此句中缺少连系动词；第二空后面有表示时间段的for a week，它需要跟延续性动词连用。