— Who's that man in our classroom? It ________ be Mr. Brown. He is much taller. — You mean the man in white? He is an exchange student from England.
A：can
B：may
C：can't
D：mustn't
我国“乌金高原”名称的由来，是因为其拥有丰富的矿产资源（ ）
ring up, reach for, test out, let sb. alone, or rather, tum around
