15.No one knowsexactly (確切地) when Chinese first grew watermelons.

分析 沒人確切地知道中國(guó)人第一次種植西瓜是什么時(shí)候.

解答 答案:exactly
通過分析句子可知,應(yīng)填詞語修飾動(dòng)詞"knows",故應(yīng)填詞語應(yīng)該為副詞.根據(jù)提示詞"確切地"可知,答案為exactly.

點(diǎn)評(píng) 做這道題時(shí)應(yīng)先判斷應(yīng)填詞語的詞性,然后根據(jù)語境寫出應(yīng)填詞語的適當(dāng)形式.

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