You____thatlettertoJames.However，youdidn't.
B
「句意」 你本应该给詹姆斯写信，然而，你没写。
「难点」 ought to have written 是虚拟语气，与本句句意相符。
_____ if I had arrived yesterday without letting you know beforehand.
Theopeningceremonyisagreatoccasion.Itisessential_____forthat.
Last March the __________ of a 19th century cargo ship was found by an underwater archaeological team.
______isnotaseriousdisadvantageinlife.
He noticed the helicopter hovering over the field. Then to his astonishment, he saw a rope ladder _____ out and three men climbing down it.