解答

17.
the price of the house
\\of which=of the house

20.
(A)" is" located on \\ be located on 房子是“被” 建在那個地方
(C)too much exposore "to" the radiation
\\ exposure to sth. 是固定用法
(D) may expose 換成 is exposed
\\ be exposed to sth. 是固定用法

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