单项选择题

The old farmer was run down by a car. He was taken to the hospital and ______ on by the chief surgeon right now.

A．operated
B．having been operated
C．is operated
D．is being operated
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单项选择题
The ______ in Janet's character has hindered her from advancement in her career.
A．error
B．merit
C．defect
D．deficient
单项选择题
No sooner had I told him the truth ______ that I should have remained silent.
A．than I had realized
B．than did I realize
C．when I realized
D．than I realized
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