(Viên chức Mầm non) 5000+ câu trắc nghiệm Ngoại ngữ có đáp án - Đề tham khảo số 3

The teacher told her students to concentrate what she was saying.

26/40

The teacher told her students to concentrate .......... what she was saying.

on

at

to

about

Giải thích

Đáp án đúng là A