Which do you prefer to use to keep in touch with your friends QQMSN?A. andB. butC. orD. so

问题补充：

Which do you prefer to use to keep in touch with your friends，QQMSN?

A. and

B. but

C. or

D. so

答案：

A. and

B. but

(答案→)C. or

D. so

解析：and和，并且；but但是，可是；or 还是，或者，否则；so因此。句意：为了和你的朋友们保持联系，你更愿意用哪一个，QQ还是MSN？结合语境可知选C。