【題目】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】考查時態(tài).句意"自2010以來,志愿者們向老人和青年提供了大量的幫助.".A過去時.B現(xiàn)在完成時態(tài).C現(xiàn)在進(jìn)行時態(tài).D一般將來時態(tài).since+點時間通常用于現(xiàn)在完成時態(tài),結(jié)構(gòu)是have/has+動詞的過去分詞,主語是volunteers復(fù)數(shù),用助動詞have.offer的過去分詞是offered.答案是B.

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