单项选择题

The doctor was asked to go back to the hospital because of ______ case.

A．an operation
B．a treatment
C．an emergency
D．an incident
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单项选择题
This problem is too hard for me to ______.
A．work at
B．work on
C．work out
D．work in
单项选择题
To ______ the truth, I don't like him at all.
A．remark
B．speak
C．talk
D．tell
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