---Mysonisaddictedtocomputergames.Heishopeless,isn’the...

問題詳情：

 --- My son is addicted to computer games. He is hopeless, isn’t he?

--- Yes, _______ he is determined to give up and start all over.

A. if          B. when           C. once           D. unless

【回答】

D

知識點：連詞

題型：選擇題