单项选择题

The illness from which Mary is suffering has now been ______ as hepatitis(肝火).

A. diagnosed
B. determined
C. deduced
D. discovered
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单项选择题
The noise was so ______ that only those with excellent hearing were aware of it.
A. dim
B. soft
C. faint
D. gentle
单项选择题
That's the reason ______ Ann could not do her part of the job.
A. that
B. of
C. because
D. why
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