The computers made by our company sell best, but several years ago no one could have imagined the

role in the markets that they ________.[ ]

A. were playing  

B. were to play

C. had played  

D. played

局部麻醉过程中，为了预防医源性感染，不包括哪项措施（）。

A.注射点擦干后，用2%碘酊消毒

B.使用一次性注射器

C.避免注射针头被污染

D.使用无菌的局部麻醉药液

E.术前3天大剂量应用抗生素