Their children felt disappointed because first they promised to take them to Ha Long

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* Mark the letter A, B, C, or D on your answer sheet to indicate the correct answer to each of the following questions.

Their children felt disappointed because first they promised to take them to Ha

Long Park and then they________their word.

played down on

drew out on

went back on

came off with

Giải thích

Chọn D Câu trúc “As a reward for sth: để tán thưởng ...”

Các đáp án còn lại không hợp nghĩa.