— When did you buy this computer? It looks so new. — I Dit for only a couple of days. Aha

问题补充：

— When did you buy this computer? It looks so new.

— I Dit for only a couple of days. A．hadB．have boughtC．boughtD．have had

答案：

解析：句意：你什么时候买的这电脑？看起来很新。我买它才几天。For+时间段，表示“有……时间”，往往和现在完成时连用。Buy为瞬间动词，不能与时间段连用；have had 有，表示状态，可与时间段连用，故选D。