单项选择题
Once more I am in Boston,（）I have not been for ten years.
A.which B.where C.that D.as
单项选择题 —Excuse me, could you tell me which bus goes to the Fine Arts Museum? —（）
单项选择题 Sometimes it's easier to talk to a stranger（）to an old friend or a relative.
单项选择题 Tom, with a dog,（） standing on the floor upstairs yesterday.
