题目内容

【题目】The volunteers ________ a lot of help to the old and the young since 2010．
A.offered
B.have offered
C.are offering
D.will offer

【答案】B
【解析】考查时态．句意"自2010以来，志愿者们向老人和青年提供了大量的帮助．"．A过去时．B现在完成时态．C现在进行时态．D一般将来时态．since+点时间通常用于现在完成时态，结构是have/has+动词的过去分词，主语是volunteers复数，用助动词have．offer的过去分词是offered．答案是B．

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