单项选择题

David has ______ much work to do that he is staying late at his office.

A．such
B．very
C．so
D．enough
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单项选择题
Lisa was busy taking notes ______ Mark was searching the Internet for the information.
A．until
B．while
C．unless
D．if
单项选择题
I can't find the key to my office, ______ have lost it on my way home.
A．would
B．must
C．should
D．ought to
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