单项选择题

The secretary worked late into the night, ______ a long speech for the president.

A) to prepare
B) preparing
C) prepared
D) was preparing
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I don't want to lend money to him; he is already in debt ______ me.
A) to
B) for
C) of
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Seldom ______ any mistakes during my past five years' service here.
A) would I make
B) did I make
C) I did make
D) I would make
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