Unfortunately, diets don‘t work for most people. They do lose weight but then go off the diet and put it back. Building a sensible diet and exercise plan is the key (1)_____ maintaining a consistent weight. You need to figure out how many calories you need in a day and how many you actually (2)______. The next step is to add exercise (3)_____ you can raise the number of calories you can consume per day.
A. for
B. with
C. at
D. to
* Đáp án
* Hướng dẫn giải
Đáp án D
Giải thích: The key to + N/Ving = chìa khóa/yếu tổ quyết định đối với cái gì/việc gì