He hated the war so much that he decided to leave the army _____.
A. for long B. once in a while
C. for good D. once upon a time
He hated the war so much that he decided to leave the army _____.
A. for long B. once in a while
C. for good D. once upon a time
C.
for good (=permanently)永久地:He says he's leaving the country
for good. for long 长久地。按本题题意，用 for long 不妥。once upon a time 从前。once in a while 偶尔。