The old woman next door is very keen _____________ growing roses.A.atB.onC.withD.to

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The old woman next door is very keen _____________ growing roses.
A.at
B.on
C.with
D.to

用法中没有AT 和with
只有be keen on STH 热衷于
和be keen to do STH 热衷于
答案是B