Louise Simms wants workshop participants to be in the art room______she begins her lecture so as to avoid any interruptions.

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问题 Louise Simms wants workshop participants to be in the art room______she begins her lecture so as to avoid any interruptions.

选项 A、before
B、off
C、except
D、on

答案A

解析 这句话中的主要成分是“Louise Simms wants workshop participants to be in the art room”,修饰成分是“______she begins her lecture so as to avoid any interruptions”,修饰成分中有谓语begins,因此答案是可以引导状语从句的(A)或(C)。根据上下文语意,此处意为“希望研讨班的参加者在上课前都可以赶到美术室”,所以应选(A)before(在……之前)。(C)except表示“除……之外”,句意不通。(B)off(离开)与(D)on(在……上)都是介词,后面应该跟名词,不能引导状语从句。
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