A 10-member committee __________ to investigate the affair.is to establish has established is to be established is established

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A 10-member committee __________ to investigate the affair.is to establish has established is to be established is established
A 10-member committee __________ to investigate the affair.
is to establish
has established
is to be established
is established

A 10-member committee __________ to investigate the affair.is to establish has established is to be established is established
选第三个be to表示命令安排等,应用被动语态