问题
选择题
---You could have asked your brother for help. He is good at math.
---Yes. A whole day________ .
A．will waste
B．had wasted
C．was wasted
D．would be wasted
答案
答案：C
could have asked是虚拟语气，表示“本可以做……”，因此答语应用过去时与上句呼应。
