HÃY CHỌN MỘT CÂU TRẢ LỜI ĐÚNG NHẤT

94. - BAI TAP TRAC NGHIEM TIENG ANH 12 TU BAI DE BAI 7 0476
BAI TAP TRAC NGHIEM TIENG ANH 12 TU BAI DE BAI 7 0476

94. That carcinogenic substances ________ in many common household items is well known.

A. are containing B. contained C. containing D. are contained