I will pay I can afford for the present.A what I think B what do I think C when I think D

问题补充：

I will pay I can afford for the present.

A what I think B what do I think C when I think D when do I think

答案：

解析：考察插入语用法。I think作为插入语放在句中，可以省略。本题的what I think I can afford for the present是一个宾语从句，what在句中作为afford的宾语，而且应该使用陈述语序，故A正确。