单项选择题
Do you know who lives in the building ()there is a wall?
A.in front ofB.in front of whoseC.in front of whichD.in front which
单项选择题 Who do you think the teacher will ()the question?
单项选择题 They were()little children that they didn’t know what to do.
单项选择题 With a lot of difficult problems(),the newly-elected president is having a hard time.