22．At last they had to give up. for they found difficult to finish so much work in such a s——青夏教育精英家教网—

摘要：22．At last they had to give up. for they found difficult to finish so much work in such a short period of time． A．that B．this C．so D．it

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At last they had to give up，for they found ____ difficult to finish so much work in such a shot period of time．

A．that B．this C．so D．it

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