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【題目】To make rivers than before, everybody is supposed to protect them.

A. dirtyB. dirtierC. cleanD. cleaner

【答案】D

【解析】

句意：為了使河流比以前更清潔，每個人都應該保護它們。A. dirty臟的；B. dirtier更臟的；C. clean干凈的；D. cleaner更干凈的。根據than判斷，這是一個比較級的句子，排除A,C；根據“everybody is supposed to protect them.”可知，保護河流的目的是讓它們更清潔干凈，故答案為D。

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