Howlonghaveyou____?
A、marriedD
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The ____of AIDS has led to an expansion in research seeking a cure.
Ithink____importanttolearnEnglishwell.
______ they are twin sisters, they don ’t look like each other.
The reason that his property was confiscated by the country, it ____, was that he was involved in a lot of fraudulent activities during the war.
The radio is________ a strange signal. What’s wrong with it?
