单项选择题

Shingles ______ by a virus which attacks the nerves.

A. is causing
B. is caused
C. are caused
D. are causing
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单项选择题
The Canterbury Tales ______ written by Chaucer.
A. has been
B. were
C. was
D. had been
单项选择题
Ten years had elapsed. I found she had ______.
A. a little white hair
B. some white hair
C. much white hair
D. a few white hairs
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