Mary spent half hour doing work.A.a;an B.an;a C.a;the D.an;the

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Mary spent half ____ hour doing ____ work.A.a;an B.an;a C.a;the D.an;the
Mary spent half ____ hour doing ____ work.A.a;an B.an;a C.a;the D.an;the

Mary spent half ____ hour doing ____ work.A.a;an B.an;a C.a;the D.an;the
D 玛丽画了一个小时做哪项工作.
hour 发音是双元音,因此用an,the表特指

an the D.an;the
half an hour 半小时
The performance finally started half an hour late 晚了半小时以后演出终于开始了
hour 元音开头单词用an
花(时间、精力)[(+on)][O4]
They spent three month touring Europe.

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an the D.an;the
half an hour 半小时
The performance finally started half an hour late 晚了半小时以后演出终于开始了
hour 元音开头单词用an
花(时间、精力)[(+on)][O4]
They spent three month touring Europe.
他们花了三个月时间周游欧洲。
They spend an hour on their homework.
他们用一个小时做作业。
They have already spent three weeks travelling in Beijing.
他们已经花了三个星期在北京旅游。

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