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These flowers should not be watered too ______, once _____.

A．long; every other day B．often; every fourth day 
C．soon; every two days D．frequently; each five days 

B

解析試題分析：第一空需要副詞，修飾動詞water, 排除A項；從題意看，澆水不要太勤，排除C項；each后接單數(shù)動詞，排除D項。every fourth day此處相當(dāng)于every four days. 故B項正確。
考點：副詞、固定搭配。

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