题目内容

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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