. Since last year, the global economic slowdown in many countries. It is expected that the world economy will not recover until the end of 2010.
A. is spreading
B. spread
C. had spread
D. has been spreading
网友回答
A. is spreading
B. spread
C. had spread
(答案→)D. has been spreading
解析：考查时态。句意：自从去年以来，全球经济减速正在许多国家蔓延。预期直到2010年底世界经济才能恢复。结合语境而可知上文描述的是过去正在进行的动作对现在的影响，故用过去完成进行时态，选D。