Keep on trying. Never . I am sure you will succeed sooner or later.
A. lose your heart
B. lose hearts
C. lose one’s hear
D. lose heart
网友回答
A. lose your heart
B. lose hearts
C. lose one’s hear
(答案→)D. lose heart
解析：考查短语搭配。lose heart“灰心”，固定搭配。句意：继续努力，不要灰心，我相信你迟早会成功的。