問題詳情：
—Did Johnson go to the concert with his family yesterday?
—The experiment report to be handed in tomorrow, he it.
A. scheduling; couldn’t attend
B. scheduled; couldn’t have attended
scheduled; couldn’t have attended
D. to be scheduled; couldn't attend
【回答】
B
知識點：虛擬語氣與情態動詞
題型：選擇題
