he_____(work)on the maths problems since seven o’clock.He _____(work)on it for two hours.i'm surehe_____(work)on the maths problems since seven o’clock。He _____(work)on it for two hours.i'm sure he_____(work)it out in one hour.麻烦认真回
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he_____(work)on the maths problems since seven o’clock.He _____(work)on it for two hours.i'm surehe_____(work)on the maths problems since seven o’clock。He _____(work)on it for two hours.i'm sure he_____(work)it out in one hour.麻烦认真回
he_____(work)on the maths problems since seven o’clock.He _____(work)on it for two hours.i'm sure
he_____(work)on the maths problems since seven o’clock。He _____(work)on it for two hours.i'm sure he_____(work)it out in one hour.麻烦认真回答下
he_____(work)on the maths problems since seven o’clock.He _____(work)on it for two hours.i'm surehe_____(work)on the maths problems since seven o’clock。He _____(work)on it for two hours.i'm sure he_____(work)it out in one hour.麻烦认真回
has worked;他从晚上7点,就开始做数学题.
has worked他做数学题做了2小时了
will
我肯定他会在1小时之内完成这道题.
祝好!
has been working.
has worked
will work
he___has been working__(work)on the maths problems since seven o’clock。
He __has worked___(work)on it for two hours.i'm sure he_will work____(work)it out in one hour
第一个是现在完成进行时,说明他还在继续做未停止,第...
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he___has been working__(work)on the maths problems since seven o’clock。
He __has worked___(work)on it for two hours.i'm sure he_will work____(work)it out in one hour
第一个是现在完成进行时,说明他还在继续做未停止,第二个是对目前的影响,用完成时,第三个是将来时,有时间状语
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