	Giang Nguyen Thi \| Chat Online
	26/08/2021 19:47:36
	Tiếng Anh - Đại học \| Tiếng Anh \| Đại học

Chọn đáp án đúng: __________ he was boarding the bus, he dropped his ticket in the gutter

__________ he was boarding the bus, he dropped his ticket in the gutter.