【单选题】【消耗次数：1】
27.She did her work _________her manager had instructed.
①
as
②
until
③
when
④
though
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②
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③
<img src=https://huaweicloudobs.ahjxjy.cn/4EBC84E7CF7FC397603943F19D58351D.png title=QQ图片20160107170641.png alt=QQ图片20160107170641.png/>
④
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①
-12
②
12
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④
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①
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①
3
②
-3
③
6
④
-6
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①
abcd-xyuv
②
adxv-bcyu
③
(ad-bc)(xv-yu)
④
(ab-cd)(xy-uv)