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【题目】So far, almost every possible means ______to provide accommodation and medical rescue for the people in the flood-stricken area.

A. were tried B. was tried

C. have been tried D. has been tried

【答案】D

【解析】

试题分析:考查时态。根据句首so far可知,这个动作是从过去一直持续到现在的,而且还可能继续下去,应该选用现在完成时,句意:到目前为止,几乎所有可能为灾区居民提供住宿、和医疗援助的办法都被试过了。根据句意可以判断, 故选D。

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