A It is an interesting and useful book.-----you begin to read it,you will like itIt is an interesting and useful book.-----you begin to read it,you will like it A.once B.because C.until 理由

A It is an interesting and useful book.-----you begin to read it,you will like itIt is an interesting and useful book.-----you begin to read it,you will like it A.once B.because C.until 理由
A It is an interesting and useful book.-----you begin to read it,you will like it
It is an interesting and useful book.-----you begin to read it,you will like it
A.once B.because C.until 理由

A It is an interesting and useful book.-----you begin to read it,you will like itIt is an interesting and useful book.-----you begin to read it,you will like it A.once B.because C.until 理由
A.once 一旦
B.because因为
C.until 直到
A

A 根据选项意思

once

A.once 一旦