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求助!(定语从句)

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( ) 4. They did ____ save the wounded soldiers. A. what they could B. that they could do C. all that they could D. all that they could do (为什么)
解题思路: 看从句中缺少什么成分 缺什么补什么
解题过程:
4. They did ____ save the wounded soldiers. A. what they could B. that they could do
C. all that they could D. all that they could do
孩子 D 是不是 all that they could to 啊?
选D 句意: 他们做所能做的事来救受伤的士兵们。
They did 后是个定语从句 all 是先行词, 定从中 do 后缺少宾语, 所以跟我讲的上个题一样 却宾语 主语 或 表语时 用 that / which 指 物, 但还有一个语法规定: all 做先行词时, 只用that 而不能用which 作引导词。 此外 之所以 要有 to 是因为 to save the wounded soldiers 是不定式表目的 “为了。。。”。前面有一个did ,后面有save 英语中这样规定 的:两个实义动词连用时 中间要用 and 或 to 连接:
go to / and see the film ; come to/ and visit Beijing
孩子 上面的句子 还可变为:
They did all that he could to save the wounded soldiers.
all / what / everything (that)
一定要背过这几句啊 考试中很有用的!

最终答案:略