【題目】the, used, so, river, to, clean, be

_________________________________________________________________.

【答案】The river used to be so clean

【解析】

the定冠詞，表示“這個”；used動詞，表示“用”；so副詞，表示“如此”，修飾形容詞；river名詞，表示“河”；clean形容詞，表示“干凈的”；be原形。根據(jù)句意，原句表示“這條河過去很干凈”，固定搭配used to do sth.“過去常常做某事”，位于句首的單詞首字母要大寫，所以空格處填The river used to be so clean。故答案為The river used to be so clean。

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