—There is a lot of smoke coming out of the teaching-building there.

—Really?It _________ be a fire,most probably.

A．can

B．ought to

C．have to

D．must

王维山水诗创作的特色是（）

A.善于写空山的宁静之美

B.善于写水乡的纯净之美

C.善于表现慷慨的情怀

D.善于抒发失意的悲哀