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【简答题】
IPv4地址分为( )段,每段8位二进制数。
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举一反三
【单选题】—How long _____ he ______ in the USA? —Three years. But he never regrets coming back to China.
A.
did;live
B.
has;lived
C.
does;live
D.
will;live
【单选题】下面( )组中的常量都是合法的
A.
-2，‘a’，e3
B.
"123"，90.5，‘a’
C.
’/n’，2.3e3.4，"ab?d”
D.
0.89，0x12e，e
【简答题】His mother being very worried, he regrets (tell) ______ her that he has lost his job.
【单选题】He now regrets______harder when he was at school.
A.
not to study
B.
not studying
C.
having not studied
D.
not to be studying
【简答题】A．He doesn't care for children's programs. B．He regrets missing the program. C．He has already seen it. D．He enjoys the program.
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