Which of the following transitional devices is not correctly used?
A.
While they are new here, they know nothing about the place.
B.
Chinese prefer to show a child how to do it, while the westerners tend to leave the children alone to have a go on their own.
C.
British students care more about their performance in sports, Chinese students whereas often put their first priority in academic results.
D.
Although they have been here for a long time, but they know nothing about the place.