Hi,Bruce.Here's a letter for you.

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Hi,Bruce.Here's a letter for you.
Thanks.I wonder____
A.who that letter was from
B.who was from that letter
C.who was that letter from
D.who from that letter was
怎么样的句子才算是陈述语序
A.who that letter was from
B.who was from that letter
C.who was that letter from
D.who from that letter was

正确答案是A
这是一个宾语从句的问题.who 在从句中做介词from 的宾语.也可以用whom.
宾语从句的语序是陈述性语序.所以不能选择C.
所谓陈述语序就是陈述句语序,陈述句包括肯定句和否定句,是区别对待疑问句的说法.如：
That letter was from my mom.那封信来自我妈妈.
That letter wasn't from my father.那封信不是来自于我父亲.
以上两句都是陈述句.
Was that letter from your mom?是一般疑问句.在一般疑问句中,be 动词要提到主语之前.这就是语序问题.
Who/Whom was that letter from?是特殊疑问句,特殊疑问句是特殊疑问词加一般疑问句构成.
所以be 动词也提到主语之前.
宾语从句最大的忌讳之一就是用疑问句语序来表达,所以 I wonder whom was that letter from?是个错误用法.
不知解释的是否清楚,有问题再问.

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