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【简答题】
设有如下关系表，由关系R和S通过运算得到关系T，则所使用的运算为（ ）。 A)T=R∩S B)T=R∪S C)T=R?S D)T=R/S
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反馈参考答案：
举一反三
【简答题】朋友帮 了 他很多忙,他欠他们的情。 (have a debt)
【简答题】朋友帮了他很多忙,他欠他们的情
【判断题】The British Home Secretary claimed that it would be impossible to protect civil liberties effectively when a terror attack was inevitable.
A.
正确
B.
错误
【单选题】It was ______ the president's speech that the secretary spent the whole morning at home.
A.
to prepare
B.
preparing
C.
prepared
D.
be prepared
【单选题】By the time Mary stepped into the office, the secretary ___________back home.
A.
will go
B.
is going
C.
has gone
D.
had gone
【单选题】The Home Secretary________ it absolutely clear that he remains committed to meeting our obligation to genuine refugees.
A.
makes
B.
has been making
C.
has made
D.
made
【简答题】Priti Patel, Britain's home secretary, came under following the resignation of the most senior in her department.
【简答题】翻译: 朋友帮了他很多忙,他欠他们的情。(have a debt)
【简答题】朋友帮了他很多忙,他欠他们情。(have a debt)
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