【題目】The volunteers ________ a lot of work for the poor area since 2001.

A.doB.didC.have doneD.will do

【答案】C

【解析】

句意：自2001年以來，志愿者們?yōu)樨毨У貐^(qū)做了很多工作。

考查現(xiàn)在完成時(shí)。do做，一般現(xiàn)在時(shí)；did做，一般過去時(shí)；have done已經(jīng)做，現(xiàn)在完成時(shí)；will do將要做，根據(jù)所給空后面的since 2001可知，時(shí)態(tài)是現(xiàn)在完成時(shí)，故選C。

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