单项选择题

We can conclude that Mr. Nelson's former wife ______.

A．was often ill
B．seldom got ill
C．had married another man
D．had undergone an operation two years before
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单项选择题
Dr. Sheeler was surprised at Mr. Nelson's call because ______.
A．the new patient should not have known his phone number
B．he seldom called at night
C．the Nelsons had been very healthy
D．the Nelsons had not called him for a long time
单项选择题
The proper title for this passage would be ______.
A．Rat the Cleverest
B．The Largest Grain Eater
C．Our Most Dangerous Enemy the Rat
D．The Dangerous Diseases Carrier
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