Hadtheyknownwhatwascomingnext,they　　　secondthoughts.A....

問題詳情：

 Had they known what was coming next, they　　　 second thoughts.

A. may have   B. could have   C. must have had         D. might have had

【回答】

D

知識點：虛擬語氣與情態動詞

題型：選擇題