Who's that book by

昨日复习：

He's hard on his kids.

美 [ hiːz / hɑːrd / ɑːn / hɪz / kɪdz ]

他对自己的孩子很严厉。

今日课程：

Who's that book by?

美 [ huːz / ðæt / bʊk / baɪ ]

谁是那本书的作者。