Wedidn’tsleepwelllastnightbecauseofthetest.Butitturned...

问题详情：

 We didn’t sleep well last night because of the test. But it turned out to be easy so we _____ worried about it.

A. didn’t need to be                                   B. couldn’t have been

C. needn’t have been                           D. mustn’t have been

【回答】

C

知识点：虚拟语气与情态动词

题型：选择题