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

D

【解析】

試題分析：考查時(shí)態(tài)。根據(jù)句首so far可知，這個(gè)動(dòng)作是從過去一直持續(xù)到現(xiàn)在的，而且還可能繼續(xù)下去，應(yīng)該選用現(xiàn)在完成時(shí)，句意：到目前為止，幾乎所有可能為災(zāi)區(qū)居民提供住宿、和醫(yī)療援助的辦法都被試過了。根據(jù)句意可以判斷， 故選D。

考點(diǎn)：考查時(shí)態(tài)

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