A letter_ ,he hurried to the shop for some shopping.

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A letter_ ,he hurried to the shop for some shopping.
posted是答案.had been posted 为什么不对啊

A letter posted ,he -- - -
------这是含有独立主格结构的句子.A letter posted 在这里做时间状语,等於after / as soon as a letter had been posted by her 或者after / as soon as she had posted a letter,she - - - - - .
独立主格的原理/要点是：在这个结构裏面保留原来从句部分的主语,保留裏面的真正动词,变成分词（现在分词或者过去分词,看主动语态或者被动来决定),去掉连接词.
又如：
When / after their guests had left,Mr.and Mrs White began doing the washing up for the family dinner party ------这是时间状语从句
-----这是含有独立主格结构的句子：
Their guests having left,Mr.and Mrs white began doing the washing up - - - .
独立主格结构的运用使句子变得更加简单明了.

1.He's ____ some presents.A.shop B.shopping C.shops for D.sh 短语辨析 do some shopping;go shopping:shop for He hurried to the railway station,------- buying a ticket fo some bar the and shop went for a to boy连词成句 Where’s your mother-she's to the shop for some food A has go i have got to drop by the shop to do some shopping The writer went _____ last week.(a)for shopping(b)for shop(c he hurried to thr station,-----to catch the early bus.A to h "He hurried to his home,with his book __ on the desk".(A.to Do some shopping in the shop的否定句 When he hurried back to the village with 999 red roses and a With some books badly needed( )she hurried to the bookstore.