题目内容
______ she stood up, she dropped the necklace.
| A．As | B．While | C．Before | D．Until |
A
解析试题分析：句意；当她站起来的时候，她把项链弄掉了。A随着B当...时候C在....之前，引导时间状语从句，常跟持续性动词。D知道...才，常于not连用。as侧重一边，一边，表达随着他的动作，项链掉了。
考点：考查连词的用法。
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