因为这里后面已经说了是 300张.已经有个确定的数字了.
如果你再用 完成时的进行时,就表示 他从5年前到现在一直在收集300张.显然意思就不对了.
因此这里只能用 现在完成时.
意思是,从五年前到现在,他已经收藏了300张图片了.
如果还有疑问请继续追问,
1.He_( collect)300pictures since5 years ago为什么不能用has been co
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