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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单项选择题
In his lifetime, he enjoyed a reputation______.
A．as great as, if not greater than, Beethoven
B．great, if not as greater as Beethoven
C．as great as Beethoven, if not greater
D．as great, if not greater, as Beethoven
单项选择题
With all the data he needed ______,Peter began to write his thesis.
A．collecting
B．being collected
C．to be collected
D．collected
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