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【单选题】
某主机IP地址为172.16.7.131/26，则该主机所在网络的广播地址是A.
172.16.7.129
B.
172.16.7.191
C.
172.16.7.252
D.
172.16.7.255
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反馈参考答案：
举一反三
【单选题】I _________my holidays in Dongshan this summer.
A.
am going to spend
B.
spend
C.
spent
【单选题】I _______ an old classmate this morning in the street
A.
came over
B.
came up with
C.
came about
D.
came across
【单选题】I'm glad _____ by him yesterday.
A.
not be seen
B.
to not have been seen
C.
not to have been seen
D.
not to have seen
参考解析：
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