Ôn thi Cấp tốc 789+ vào 10 môn Tiếng Anh (Đề 17)

It is not too hard for us (23) ______ why there is a TV set in almost every home today.

23/36

It is not too hard for us (23) ______ why there is a TV set in almost every home today.

see

to see

to seeing

seeing