—How long has John been here?— Two years, he still has no friends.A. andB. soC. butD. or

—How long has John been here?
— Two years, he still has no friends.
A. and
B. so
C. but
D. or

A. andB. so(答案→)C. butD. or解析：and和，并且；so因此；but但是；or或者，否则。句意：约翰来这儿多久了？——两年，但是他还没有朋友。联系上下文可知前后是转折关系，故选C。

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