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【单选题】
下列哪一项不是数据定义语言中使用的语句( )。A.
CREATE
B.
SELECT
C.
ALTER
D.
DROP
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反馈参考答案：
举一反三
【简答题】I’m very tired. I _______ on the night shift for several weeks. A．worked B．had worked C．have been working D．have worked
【简答题】the Odyssey could have been the work of a single poetic genius.
【简答题】crescendo(cresc.)是表示( )
【单选题】How many men does your uncle _____ for him?
A.
have worked
B.
have to work
C.
have working
D.
have been working
【简答题】The difficulties have been overcome, the work has been finished and the problem solved.
【判断题】Scientists have started work on vaccines and on treatments to make infections less severe. Vaccines for the novel virus have been developed.
A.
正确
B.
错误
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