You____thatlettertoJames.However，youdidn't.
A、oughttowriteB
「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。
Theopeningceremonyisagreatoccasion.Itisessential_____forthat.
Modern（）perhapscausesmoreproblemsthanitsolves.
_____atinthisway,thepresenteconomicsituationdoesn'tseemsogloomy.
Nancywassurprisedthattheyhave（），Theyseemedtobeahappycouple.
Itwasrecommendedthatpassengers_____smokeduringtheflight.
