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美國(guó)的氣候是多種多樣的。4.“more than one/many a+單數(shù)名詞”作主語(yǔ),“more than one+單數(shù)名詞”和“many a +單數(shù)名詞”作主語(yǔ)時(shí),謂語(yǔ)動(dòng)詞用單數(shù)。如:More than one student has seen the film.不止一個(gè)學(xué)生看過(guò)這部電影。Many a strong man has weakened before such a challenge.許多堅(jiān)強(qiáng)的人遇到這種困難都動(dòng)搖了。指同一個(gè)人或事物的A and B結(jié)構(gòu)(如knife and fork 刀叉,bread and butter 黃油面包,a teacher and writer 老師兼作家,fish and chips 魚和炸土豆片)作主語(yǔ)時(shí),謂語(yǔ)動(dòng)詞用單數(shù)。如:A worker and writer was present at