It is reported that two schools, ___   are being built in my hometown, will open next year.[      ]

A. they both  

B. both of them  

C. which both  

D. both of which

移植物抗宿主反应常见于（）。

A.心脏移植

B.肝移植

C.皮瓣移植

D.骨髓移植

E.胰腺移植