单项选择题

You can borrow my computer ______ you promise to use it carefully.

A．as long as
B．since
C．while
D．so that
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单项选择题
The policeman demanded that she ______her identity card.
A．show
B．showed
C．would show
D．had shown
单项选择题
I regret ______that wonderful art exhibition last night.
A．not to see
B．not having seen
C．to not see
D．having not seen
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