—Look, Mr. King is swimming in the pool.

—It ________ be Mr. King. He has gone to Kunming on vacation.[ ]

A. can

B. can't

C. must

D. mustn't

大理石的贮存应满足（）要求.

A.板材应在室内贮存，室外贮存应加遮盖

B.板宜直立码放，光面相对，倾斜度不大于150，层间加垫，高不超过1.5mm

C.板材不得在室外贮存

D.板不应直接立在地面上，应有垫板，雨季应有排水，不允许积水

E.按板材品种，规格、等级或安装部位的编号分别码放