阻止微管解聚的抗癌药是（）

A.氟尿嘧啶

B.环磷酰胺

C.巯嘌呤

D.甲氨蝶呤

E.紫杉醇

Liu Fan is working on TV advertisement, but right now he is（）holiday.

A.in

B.on

C.for