We are glad to receive your telegraphic order of May 6 ______ regret that we can- not supply the goods ______ the end of May.

A. but, by



B. and, by
C. but, for



D. and, for

收容教育所在对社会开放活动过程中，参观者经所领导同意后可以与被收容教育人员座谈、交流，不需要征得被收容教育人同意。