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I’m not a teacher in this school.I _____ until a new teacher arrives.
A.am just helping outB.could just help out
C.just help outD.have just helped out
A

试题分析:考查时态。句意:我不是这个学校的老师。我现在只是在这里帮忙直到一个新老师来。根据句意说明现在我只是在这里帮忙,故使用现在进行时。故A正确。
点评:时态的考查要放在上下文的语境中进行,要注意抓住句子的关键词。
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