【C13】A．satB．sittingC．setD．setting

安全传输电子邮件通常采用（）系统。A.FTTPB.PGPC.SETD.SSL

A．takeB．giveC．setD．turn

【C12】A．could have setB．should have setC．ought to have setD．need to have set

【C4】A．decidedB．madeC．setD．set up

【C5】A．focusedB．directedC．setD．stated

【C8】A．shareB．reserveC．setD．possess