单项选择题

Social workers often use ______ in their research.

A．frauds
B．narrations
C．refutations
D．questionnaire
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单项选择题
Many people nowadays ______ an oath that he will never get married.
A．quote
B．swear
C．declare
D．claim
单项选择题
If the world was really like what the figure pictures, then each individual today would have only one ______ a hundred or a million generation.
A．manufacturer
B．offspring
C．descendant
D．ancestor
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