题目内容

The factory has been closed          a year ago.
A．alreadyB．sinceC．forD．yet
B
本题考查介词since的使用。本题的含义为自从一年前这家工厂就已经关闭了。since引导时间状语，主语使用完成时态，表示“自从…”的含义，与本题相符。而already为副词表示已经的含义，yet为副词表示已经或者是还的含义，for表示达或计的含义，后跟时间长度，后三个单词与本题意思不符，故本题选B。
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