Đề thi chính thức Tiếng Anh vào 10 năm 2020-2021 (Đề 30)

It is complicated because (19) ______ pollution is caused by

19/36

It is complicated because (19) ______ pollution is caused by things that benefit people.

many

much

a lot

a few

Giải thích

Đáp án B