OG详解-OG2 文法 Q15

Choice B is the best answer. The convention being tested is finite and nonfinite verb forms within a sentence. A main clause requires a finite verb to perform the action of the subject (in this case, “people in the Americas”), and this choice supplies the finite past perfect tense verb “have used” to indicate what people in the Americas used the gourd for. 
Choice A is incorrect because the nonfinite to-infinitive “to use” doesn’t supply the main clause with a finite verb. Choice C is incorrect because the nonfinite participle “having used” doesn’t supply the main clause with a finite verb. Choice D is incorrect because the nonfinite participle “using” doesn’t supply the main clause with a finite verb.