单项选择题

Jeans, originally designed by Levi Strauss, ______.

A．have become a symbol of the fashionable class
B．have come to symbolize changes in social attitude
C．are suitable wear for rough work only
D．are no longer so popular as they used to be
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单项选择题
Nowhere in nature is aluminum found free, owing to its always ______ with other elements, most commonly with oxygen.
A．being combined
B．having combined
C．to combine
D．combined
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．trace
B．trail
C．track
D．touch
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