题目内容
The old couple looked at the plane with their son on it until it was ______.
A. at the first sight B. out of sight
C. in sight D. at the sight of
B
【解析】
试题分析：考查介词短语。A. at the first sight乍一看；B. out of sight看不见；C. in sight看见；D. at the sight of 看到。。时；句意：夫妇看着儿子坐飞机远去，直到看不见。根据句意可知选B项。
考点 : 考查介词短语
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