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A．cause
B．make
C．leave
D．prove
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单项选择题A．itsB．whichC．whoseD．what

A．its
B．which
C．whose
D．what

单项选择题Most educators objected to Stokoe's idea because they thought ______.

A．sign language was not extensively used even by deaf people
B．sign language was too artificial to be widely accepted
C．a language should be easy to use and understand
D．a language could only exist in the form of speech sounds