【題目】Thomas has already finished his report on fighting against pollution. (改為否定句)

Thomas _________ finished his report on fighting against pollution _________.

【答案】hasn't yet

【解析】

句意:托馬斯已經(jīng)完成了他關(guān)于與污染作斗爭(zhēng)的報(bào)告。

本句為現(xiàn)在完成時(shí),它的否定構(gòu)成為“haven’t/hasn’t+過去分詞”,且完成時(shí)常用于否定句的標(biāo)志詞為yet。故填①hasn’t,②yet。

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