THE AIR INSIDE A HOUSE OR OFFICE BUILDING OFTEN HAS HIGHER CONCENTR...
27.The air inside a house or office building often has higher concentrations of
contaminants________ heavily polluted outside air.
A.than does
B. more
C. as some
D. like of
Bạn đang xem 27. - Đề ôn thi vào lớp 10 chuyên Tiếng Anh năm học 2019 - 2020 số 17
