More than one teacher _____ told him it is important that he learn English well if he _____ aboard.

A．have; shall go

B．has; want to go

C．has; wants to go

D．had; will go

慢性粒细胞性白血病的特点（）

A.成年人多见

B.可发生急变

C.瘤细胞有特征性Ph¹染色体

D.可合并血小板增多症

E.瘤细胞多为幼稚或成熟粒细胞