Steel production has been ______ the decline in these countries.A、inB、onC、toD

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问题 Steel production has been ______ the decline in these countries.

选项 A、in
B、on
C、to
D、of

答案 B

解析本题为固定搭配题。be on the decline表示“走下坡路”，in，of，to不与the decline构成固定短语。但是在现代英语中in decline可以表示“下降”。所以答案为B)。

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