—My son is addicted to drugs. He isn’t hopeless is he?—Yes he mends his ways and starts

问题补充：

—My son is addicted to drugs. He isn’t hopeless, is he?

—Yes, he mends his ways and starts all over.

A. if

B. when

C. even if

D. unless

答案：

A. if

B. when

C. even if

(答案→)D. unless

解析：考查连词辨析。A如果；B当…时；C即使；D除非，如果…不…；句意：—我的儿子染上了毒瘾。他没有希望了，是吗？—不，他有希望。除非他能痛改前非，重新做人。根据句意说明D正确。