--What are you doing now?
-- I’m talking to Mary online. She from Canada a few days ago.
A. is ing back
B. e back
C. came back
D. went back
网友回答
A. is ing back
B. e back
(答案→)C. came back
D. went back
解析：考查固定短语和时态。句子中有a few days ago，故用一般过去时，而e back固定短语返回。故选C。