______ she stood up, she dropped the necklace.

A．AsB．WhileC．BeforeD．Until

A

解析試題分析：句意；當(dāng)她站起來(lái)的時(shí)候，她把項(xiàng)鏈弄掉了。A隨著B當(dāng)...時(shí)候C在....之前，引導(dǎo)時(shí)間狀語(yǔ)從句，常跟持續(xù)性動(dòng)詞。D知道...才，常于not連用。as側(cè)重一邊，一邊，表達(dá)隨著他的動(dòng)作，項(xiàng)鏈掉了。
考點(diǎn)：考查連詞的用法。

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