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The volunteers __ a lot of help to the community for nearly ten years.
A．offeredB．will offerC．a(chǎn)re offeringD．have offered
D
本題難度適中，考查現(xiàn)在完成時(shí)，由for nearly ten years.可知是用現(xiàn)在完成時(shí)，選D答案。
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