ping( )命令的含义是ping本机 。
B
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What a nice day! How about the three of us _____ a walk in the park nearby.
I can still remember the sitting room ____ I used to sit in the evening.
Mr. Green is used to_________ two apples after lunch every day.
Tom, with his parents______ to America. They_____ back in two weeks.
We _____ you of our readiness to serve you in this end all future business.
The first step in the study of any language is observing and ____ precisely what happens when native speakers speak it.
I am sorry I have no time at present to ____more detail or give you an account of other cities of interest.
The ____ populated area was a breeding place forinfectious diseases.
It is imperative that you ____ here in time.
It happened in front of a fruit and vegetable ____in my neighborhood.