单项选择题


A．college
B．grade
C．instruction
D．discipline
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单项选择题
A．spreadB．spread outC．been spreadD．spread itself
A．spread
B．spread out
C．been spread
D．spread itself
单项选择题
A．instructionalB．educationalC．constructionalD．developmental
A．instructional
B．educational
C．constructional
D．developmental
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