It is important that the forms should (send)______ back before the deadline.be s

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问题 It is important that the forms should (send)______ back before the deadline.

选项

答案 be sent

解析句意：表格须在最后期限前送回，这很重要。该题考查的是被动语态。form和send是被动关系，应用被动语态。

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