题目内容
（请给出正确答案）
A.distant
B.distance
C.distancing
D.be distant
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A.must be
B.must have been
C.should be
D.should have been
A.must have received
B.must receive
C.would have received
D.would receive
A.Must, can’t
B.Must, needn’t
C.May, needn’t
D.Can, mustn’t
A.Public keys must first be exchanged to enable data encryption, and then the system exchange host keys to enable authentication without passwords.
B.The system must exchange host keys to enable data encryption, and individual users must exchange public keys to enable authentication without passwords.
C.A key pair must be obtained from a CA to enable data encryption, then host keys must be exchanged to enable authentication.
D.A key pair must be obtained from a CA to enable authentication, then host keys must be exchanged to enable data encryption.
A.Judging by
B.is coming
C.think
D.must have
