2015年职称英语考试：完形填空语法考点（6）
2014-07-14 11:18 来源：医学教育网
为帮助考生有效备考2015年职称英语考试，网校特意整理了职称英语相关复习资料，希望对您学习职称英语有所帮助！
英语时态
1.Dr.Smith______the research for five years but he still hasn't found the result.
A.have done B.has done C.did D.does
2.In the UK,technologies like this achieve a______per cent drop in vehicle-related crime since 1997.
A.have helped B.helped C.had helped D.was helped
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