his first plan were ________(success的不同形式)so he had to try a third time.

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hisfirstplanwere________(success的不同形式)sohehadtotryathirdtime.hisfirstplanwere________(success的不同形式)s

his first plan were ________(success的不同形式)so he had to try a third time.
his first plan were ________(success的不同形式)so he had to try a third time.

his first plan were ________(success的不同形式)so he had to try a third time.
填unsuccessful
是形容词,因为前面有were ,形成系表结构,同时,根据下文,是不成功的,还要加上否定性前缀

his first plan were __unsuccessful______(success的不同形式)so he had to try a third time.