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    . 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 spreadingB．spreadC．had spreadD．has been spreading
    D
    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。
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