"I will let you know the answer by the end of this week,” Tom said to Janet.
A. Tom suggested giving Janet the answer by the end of the week.
B. Tom promised to give Janet the answer by the end of the week.
C. Tom insisted on letting Janet know the answer by the end of the week.
D. Tom offered to give Janet the answer by the end of the week.
I will let you know the answer by the end of this week - Tôi sẽ cho bạn biết câu trả lời vào cuối tuần này => Đây là một lời hứa => Đáp án là B. promise to do something: hứa làm gì.
Các đáp án : A. suggest+ V-ing: gợi ý làm gì ; insist on + V-ing: khăng khăng ....; offer to do something: đề nghị ...