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幼苗
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只要是并列的两个系动词,后面的那个系动词就能省略,即使是被动形式的也能省略.如:
His father is a doctor and his mother ( is 〉a nurse.
To know is one thing,and to teach (is)quite another.知道是一回事,教又是一回事.
He is a millionaire and his father (is) without a cent.他是百万富翁,而他父亲却不名一文.
Our flat is on the first floor and theirs (is) on the third.我们的公寓在一楼,他们的公寓在三楼.
He was injured in the accident and (was) sent to hospital.
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be动词既是系动词也是助动词。第一个is是系动词,第二个是助动词,不属于一类,故第二个is不能省略。