Wedidn’tsleepwelllastnightbecauseofthetest.Butitturned...

問題詳情：

 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

知識點：虛擬語氣與情態動詞

題型：選擇題