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问题: At last I found my found my unbrella_____I had left it.

A.where
B.that
为什么B不能选

解答:

如用that, 则指注句中的 umbrella, 而it, 也指umbrella,"that I had left it" 重复, 所以不可选。
如果改为 "that i had left"就对了,做为"umbrella"的补充说明。
而题中的正确答案 "where"最为地点状语,补充说明"found"的地点。