49. "You can't come in without a ticket," the woman told us. A. The woman refused to let us in without a ticket. B. The woman refused to us come in without a ticket. C. The woman refused to let us in without tickets. D. The woman refused to let us in without ticket.

49. "You can't come in without a ticket," the woman told us.
----> C. The woman refused to let us in without tickets.

Giải thích: 

Refuse + to Verb: từ chối làm gì

-> Loại B

Tân ngữ số nhiều -> Loại A, D

49. "You can't come in without a ticket," the woman told us.

A. The woman refused to let us in without a ticket.

B. The woman refused to us come in without a ticket.

C. The woman refused to let us in without tickets.

D. The woman refused to let us in without ticket.

-> Đáp án đúng là C.

- refuse + to V-inf.

- Câu trần thuật nên lùi thì (hiện tại đơn -> quá khứ đơn).

- without + noun/ V-ing.

- us là số nhiều nên tickets số nhiều có s.