The left-behind kids(留守兒童)can’t see their parents_________ the parents come back home from work.

A. but B. until C. or D. if

B 【解析】 試題句意:留守兒童們直到他們的父母打工回來才能看到他們。but 但是，表示轉(zhuǎn)折；until直到……時候，常用在否定句中，not…until,意思是直到……才……；or 或者，否則；if 如果，是否。根據(jù)句意可知選B。
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