This is an important problem _______ too few social scientists have researched.【单选题】

时间：2021-06-28 15:05:31 解答: 82 次

This is an important problem _______ too few social scientists have researched.

A. which

B. that

C. into that

D. into which

正确答案：

参考解析：

into which 引导的是 problem 的定语从句。 which 指代 problem ，into 与 research 搭配。

请充值VIP继续使用（未注册用户支付后会自动注册登录）