题目内容
2.The reports went missing in 2012and nobody them since then.( )| A. | sees | B. | saw | C. | has seen | D. | had seen |
分析 那些报告于2012年丢失了,从那以后没有人见过它们.
解答 答案:C.后面的since,此处意为:从那以后.表达的动作发生在过去,对现在造成一定的影响,故用现在完成时have/has+过去分词,主语是不定代词nobody,故has.see的过去分词seen,故选C.
点评 since短语或从句表示过去的动作延续至今,since之后的时间为一点. 如:
Mr.Smith has worked here since 1984.1984年以来,史密斯先生一直在这工作.
He's learned about 5,000 English words since he went to college.他上大学以来大约学了五千个英语单词.
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