一道完型填空的题Late that night she was in bed ,____ about the prese

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一道完型填空的题
Late that night she was in bed ,____ about the presents when the door opend and in came her grandma.
A.buying B.bought C.thinking D.thought
正确答案是C.AB肯定错.可是为什么不选D呢?前面后面不都是过去式的么?

希望我的解释有帮助
1这是伴随状语
一、伴随状语表示与谓语的动作同时发生,通常可以改为用并列连词and连接的谓语或并列句,例如：
Late that night she was in bed ,thinking about the presents when the door opend and in came her grandma.
由于was in bed 和think about的动作同时发生,所以,可改成
Late that night she was in bed（ ,）and thought about the presents when the door opend and in came her grandma.
二、此外,WITH +SB.（STH）+现在分词或过去分词,也可做伴随状语,例如:
HE CAME BACK WITH HIS LEG BLEEDING.(例1)
他回来了,腿在流血
HE CAME BACK WITH HIS LEG BROKEN.(例2)
她回来了,腿被打折了
2所以如果D改成and thought 就对了
当然我知道肯定有一个是混淆的,就是表示一连串动作的发生
知识衍生,
表示过去发生的一连串动作.
He put down the heavy box, took out the keys, and opened the door.
他放下这沉重的箱子,掏出钥匙开了房门.
过去发生的一连串动作,若用and, or, but等并列连词连接,则一律用过去式（一般现在时除非现场报道描述一个人在做的事情,情况少）.
They moved the chairs to the table, sat down and began to have supper.
他们把椅子搬到桌边,坐下开始吃饭.
3正如你所见, 并列的动作之间必须要有and, or, but等并列连词连接.如果没有,那么动名词ing充当主语来构成从句

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