Whenyougotlostintheforest,Iguess,you

問題詳情：

 When you got lost in the forest, I guess, you_______ very frightened.

A. must be                    B. must have been     C. should                D. should have been

【回答】

 B  must have been very frightened 表示“過去一定很害怕”。

知識點：虛擬語氣與情態動詞

題型：選擇題