单项选择题


A．needn't have been taught
B．don't need to be taught
C．must never have been taught
D．may never have been taught
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单项选择题
A．appraisalB．concentrationC．acknowledgementD．appreciation
A．appraisal
B．concentration
C．acknowledgement
D．appreciation
单项选择题
A．be trueB．make sureC．reassureD．rectify
A．be true
B．make sure
C．reassure
D．rectify
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