单项选择题

The old man has two daughters, _______are doctors.

A．both of them
B．both of whom
C．both who
D．they both
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单项选择题
After Jane''s husband died, she suffered a good deal of _________over the years.
A．unfortunate
B．fortunate
C．misfortune
D．misfortunate
单项选择题
The little boy had no choice but to look on _________as his mother was seriously injured in the traffic accident.
A．help
B．helpless
C．helpness
D．helplessly
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