He began to because every means tried already.
A. lose heart; has been
B. lose heart; had been
C. lose his heart; was
D. lose his heart; had
网友回答
@@A. lose heart; has [email protected]@(答案→)B. lose heart; had [email protected]@C. lose his heart; [email protected]@D. lose his heart; had
解析：
try发生在began之前，所以用过去完成时。lose heart 意思是“灰心，失去信心”；而lose one’s heart to意思是“爱上某人”。