問題詳情

【題組】46. What does “this” in the third paragraph refer to?
(A) Recording messages.
(B) Conducting research.
(C) Behavior learning.
(D) Whistle copying.

參考答案

答案：D
難度：適中0.410256
統計：A(5),B(7),C(9),D(16),E(0)