—Where is Xiao Wang?

—I don't know．He__________ be in the library.

A．can

B．must

C．might

D．may

引起中性粒细胞减少最常见的疾病是

A．流行性感冒
B．阑尾炎
C．狂犬病
D．肺炎
E．肝癌