Question

【题目】—Jack looks sad this morning. Do you know the ________?

—His dog gets ill. It makes him sad.

A. subject B. question C. lesson D. reason

Answer 1

【答案】D

【解析】句意：——杰克今天早上看起来伤心。你知道原因吗？——他的狗生病了。这使他伤心。subject科目，question问题，lesson课，reason原因。根据His dog gets ill. It makes him sad.可知此处解释他伤心的原因，故选D。