Mark the letter A, B, C or D to indicate the underlined part that needs correction in each of the following sentences.

Câu hỏi

His parents asked him to buy books which he found them useful and necessary for his study.

A. to buy

B. them

C. necessary

D. study

Đáp án
B. them

Câu hỏi thuộc Bài tập:

E11- GS- Unit 2- Practice 5