. --- My son is addicted to drugs. He isn’t hopeless, is he?
--- Yes, he mends his way and starts all over.
A. if
B. when
C. even if
D. unless
网友回答
A. if
B. when
C. even if
(答案→)D. unless
解析：连词考查题。if“如果” when“当…时候” even if“即使” unless“除非”。根据句意“除非你儿子改过自新，要不然他是无可救药的。”所以答案为D。