单项选择题

A．system
B．instrument
C．mean
D．solution
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单项选择题
A．establishesB．buildsC．foundsD．erects
A．establishes
B．builds
C．founds
D．erects
单项选择题
A．is divedB．dividedC．divideD．have been divided
A．is dived
B．divided
C．divide
D．have been divided
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