Bộ 3 Đề kiểm tra Unit 6 - Tiếng anh 10 iLearn Smart World có đáp án (Đề 1)

Books ______________to their place before you leave the library.

19/45

Mark the letter A, B, C or D on your answer sheet to indicate the correct answer to each of the following questions.

Books ______________to their place before you leave the library.

may return

must be returning

must return

must be returned

Giải thích

Chọn D