单项选择题
（）to speak at the meeting，I couldn’t very well refuse.
A.Called upB.Called offC.Called atD.Called on
单项选择题 It （）that the necklace was made of glass.
单项选择题 Children should learn how to dress after they get up.
单项选择题 Our director had（）on the matter for a long time before he made the decision.
