during的用法They __ nothing to heip the homeless girl during th

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during的用法
They __ nothing to heip the homeless girl during the last school year.
A have done B did C do D had
为什么A为正确答案?
during到底是现在完成时的标志词，还是一般现在时的？（打错了）

during + 时间
表示在某段时间里.
常用作现在完成时态的时间状语 !11
现在完成时态常接的时间状语：
如so far,by now,up to(till)now,for,since, in the past few…,during the last few…等. We have planted more than two thousand trees by now
　现在完成时由“have/has+过去分词”构成,主要有两个含义：
　　①表示动作发生在过去,但与现在的情况有联系,有时无时间状语,有时和一些表示不确定的过去时间状语连用,如：many times,just,yet,ever,never,just,already,before,so far, by now等连用.
　　②表示从过去某一时间开始一直延续到现在并还可能继续延续下去的动作,用于延续性动词,且句中常带有表示一段时间的时间状语,如：since + 时间点/从句,for two months, so far等.

during的用法They __ nothing to heip the homeless girl during th 介词during的用法关于during的用法 The man invites the woman to go to his parents' in during th during the Some of us girls are planning to drive to the city during th They urged__the library open during the vacation during the vacation,they go to__places They asked me-----------during the summer holiday.- during In this experiment,they are wakened several ttimes during th .since many of them worked during the day,bill had to get th