英文 its vs. whose - 考試

. They own an original Picasso painting, ____ value is inestimable.

(1) its (2) whose (3) which (4) how much


正確答案為(2) whose

已知可以排除(4), 而(3) which 後要接V 也去除 // ex: which is inestimable.

我的困惑是在(1) 為何不行？感覺也挺順的



之前也有看過類似題目

Not far from the school there was a small house, ____ owner seated in it reading story book with his children every evening.
(A):whose (B): its


正確答案卻是(B)


所以這讓我有點困惑 揪竟要如何判斷呢?



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