—Tom didn’t come last night did he?—No.I have waited for him.A whole night was wasted.A

问题补充：

—Tom didn’t come last night,did he?

—No.I have waited for him.A whole night was wasted.

A. would

B. should

C. couldn’t

D. needn’t

答案：

A. would

B. should

C. couldn’t

(答案→)D. needn’t

解析：needn’t have done表示“本没有必要做但实际上做了”。