______, the researchers cannot concentrate on that very precise experiment.

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问题 ______, the researchers cannot concentrate on that very precise experiment.

选项 A、With you standing there
B、On your standing there
C、You are standing there
D、You stand there

答案A

解析 本题测试分词的独立结构。分词有时带有自己逻辑上的主语,叫做独立结构,经常由with引出,本句中stand和you是主动关系,故用现在分词。C和D很容易排除,因为两个句子之间由逗号隔开,应有连词连接;B项On your standing there意为“刚一站在那”,与题意不符。
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