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将下列主动语态变成被 将下列主动语态变成被动语态.1.We must finish the work in two da

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将下列主动语态变成被
将下列主动语态变成被动语态.
1.We must finish the work in two days.
    The work must _____ in two days.
2.Mrs.Green has given Robert a present for Christmas.
    Robert _____ a present for Christmas.
3.We have used paper and printing for ages.
    Paper and printing _____ for ages.
4.He doesn't think computers can replace books.
    He doesn't think books _____ by computers.
5.We have bought some gifts for the poor children.
    Some gifts _____ for the poor children.
将下列主动语态变成被 将下列主动语态变成被动语态.1.We must finish the work in two da
1.be finished   2.has been given   3.have been used     4.can be replaced         5.have been bought