单选题
When she returned {{U}}back by{{/U}} abroad, she told us all about her experience as an illegal immigrant.
A、
by
B、
back
C、
from
D、
back from
【正确答案】
C
【答案解析】
[解析] 习惯搭配。 return from (=go back)返回：She returned (home) from a holiday．她度假归来。
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