单项选择题

This book has been in the works so long that I have lost ______ of most of the sources found for me by the staff of the library.

A．track
B．trail
C．trace
D．clue
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The football player was not nominated by the committee, ______ not very popular with all its members.
A．to be considered
B．considering
C．being considered
D．having considered
单项选择题
We hadn't met for 8 years, but I recognized her ______ I saw her.
A．the moment
B．for the moment
C．the moment when
D．at the moment when
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