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【单选题】
Linux操作系统是一个类()操作系统A.
Windows
B.
Mac OS
C.
MS-DOS
D.
UNIX
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反馈参考答案：
举一反三
【单选题】Next door to ours _________, who has just return from abroad.
A.
where lives an old man
B.
lives an old man
C.
where does the old man live
D.
does an old man live
【单选题】A man has to make______ for his old age by putting aside enough to live on when old.
A.
supply
B.
assurance
C.
provision
D.
adjustment
【单选题】The old man _______ since ten years ago.
A.
died
B.
has been died
C.
has died
D.
has been dead
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