题目内容

【题目】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

【答案】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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