单项选择题


A．spread
B．spread out
C．been spread
D．spread itself
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单项选择题
A．instructionalB．educationalC．constructionalD．developmental
A．instructional
B．educational
C．constructional
D．developmental
单项选择题
A．problemB．rateC．issueD．degree
A．problem
B．rate
C．issue
D．degree
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