问题: 选什么？为什么？
2）Then Mrs。Smith told me （） he was very important
A。that
B。why
C。what that
D。why what
3）He is my son，（）a better son does not exist
a。but
B。than who
C。against whom
D。than whom
解答:
2）Then Mrs。Smith told me （D） he was doing was very important
A。that
B。why
C。what that
D。why what
选A从句少宾语,应改为that what,翻译为:然后Smith夫人告诉我他做的事情是非常重要的。
B的错误理由一样，C，that与what位置不对，told me that...
选D翻译为：然后Smith夫人告诉我为什么他做的事情是非常重要的。
3）He is my son，（D）a better son does not exist
a。but
B。than who
C。against whom
D。than whom
原句是这样的两个句子：
He is my son.
A better son than him doesn't exist.
合并起来变成一个定语从句，将重复的him替代，先行词部分是than的宾语，所以用宾格whom
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