To his surprise , the umbrella was not _____ he had put. 选择题？

很明显，这考查是表语从句！
TO his surprise，是一个短语，表示令某人吃惊的是，对后面句子结构没有影响。
the umbrella是主语，was 是系动词，后面明显要一个表语，用一个从句来充当。这里是一个地点名词充当表语，表示放的地方，肯定要用where了！也可以改成定语从句：To his surprise , the umbrella was not at the place (where)he had put.这个定语从句中的where是可以省略，是一种特殊情况。

应该是HE HAD PUT THE umbrella at the place
但是变成从句后没有了AT 所以就不用A
如果有 at,in WHICH 也可以~~

这是状语从句啊～
意思就是说，那把伞不在他放的那个地方了
c的话应该是at the place吧～