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She ____ necklaces with the help of Ms Sullivan when she ____ that she had made some mistakes.
A.was working, was noticingB.made, was noticing
C.made, noticedD.was making, noticed
D

试题分析:考查时态。句意:当她注意到增加已经犯了一些错误的时候,她正在Ms Sullivan的帮助之下做项链。根据句意说明是在过去的某个时间点上正在进行,正在发生的事情,故使用过去进行时。故D正确。
点评:英语中的时态主要由动词的形式决定,因此在学习英语时态时,要注意分析动词形式及具体语境,想象在那个特定的时间动作所发生的背景,这个动作是经常性动作、一般性动作、进行性动作、完成性动作还是将要发生的动作。
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