52._________A. attendingB. registeringC. inviting

178 children who are【B13】______in a multidisciplinary researchA.enrolledB.registeringC.ent

We invited him to the party the next weekend, but he _____ the invitation.A、refusedB、r

以下SIPmethod中，有可能被借用来作为VOIP心跳消息的是：________。A.PRACKB.CANCELC.INVITED.OPT

_________(52)A.attending B.registeringC.living D.

_________(52)A.attending B.registeringC.living D.

_________(53)A.provide B.proveC.invite D.suggest