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-道英语填空'i ______(explain) this to you several times already,'

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-道英语填空
'i ______(explain) this to you several times already,'said the teacher,'i hope you _________(understand)it now.'then he looked at a little boy at the back of the class.'______you ______(listen),Jones?"he asked.'here is a simple problem:"Sally______(work)in an office for 34 weeks.in that time ,she______(earn)300pounds a week .how much ______she _____(earn) so far "'
"please,sir ,'Jones answered ,'i can only answer your firet quextion .i ________(not listen)
动词的时态有现在完成进行,现在完成,和一般现在时
have explained (句中有already,用现在完成时)
understand (hope+从句,主句是一般现在时,从句描述事实,用一般现在时)
Are ,listening (正在进行的动作,用现在进行时)
has worked(for+ 一段时间用于现在完成时)
earned (in that time表示过去时间的状语,时态用一般过去时)
has earned(so far迄今为止,也是用于现在完成时的时间状语,主语是第三人称,动词也应为第三人称单数形式,所以have改为has )
was not listening (该句话表示过去正在进行的事情,用过去进行时)