He thought he could talk Mr. Robinson _____ buying some expensive equipment. A. on B. of C. round D. into 我查了下字典，talk round 和talk into都有说服的意思。

选D into,talk sb into doing是固定结构，就像persuade/fool----sb into/out of doing---一样说服----做/不做-----

learning ：   talk sb into。

一般说服别人都是talk sb. into doing sth.
talk round我们很少提。