my parents _allow me to play outside until I__my homewor

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my parents ___allow me to play outside until I____my homework.
A do not,finish B will not,finished C did not,finisned

正确答案：选C
即：Myparents didn't allow me to play outside until I finished my homework.
翻译：直到我写完作业,我父母才允许我出去玩.
解析：not ...until ...直到.才...,而且本句描述的是过去发生的事情,用过去式.
有不明白的请继续追问,
再问： not ...until ... 直到....才...，这种句型是除了主将从现，就是过去时吗？
再答：应该是这样的，因为可以用于将来时，也可以用于描述过去时的句子中。 until 的用法 “主将从现”，即：主句一般将来时，从句一般现在时例句： I won't go out until you come back. 直到你回来，我才会走。 I will wait for you until six o'clock. 我会等你直到6点。另外还常和 not 一起搭配 not……until 要根据情况来决定例句：I didn't go to bed until ten o'clock last night. （一般过去时）昨晚直到十点钟我才睡觉。 I did not go home until my mother called me. （一般过去时）我直到我妈妈打电话给我才回家。 Don't get off the bus until it has stopped. （现在时）直到车停下来才能下车。所以，再来看你这道题，A答案，主句应该用将来时，所以A是错误的，B的时态混乱，也是错误的，所以C是正确答案。 A的正确形式应该是 My parents won't allow me to play outside until I finish my homework. 直到我完成作业，我父母才会让我出去玩。 B的正确形式应该是： My parents won't allow me to play outside until I finish my homework. （主将从现）直到我完成作业，我父母才会让我出去玩。或： Myparents didn't allow me to play outside until I finished my homework. （一般过去时）直到我写完作业，我父母才允许我出去玩。 C答案是用的过去时，是not ...until...用法中的一种。

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