单项选择题

A．on
B．for
C．with
D．in
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单项选择题
A．enterB．participateC．fallD．involve
A．enter
B．participate
C．fall
D．involve
单项选择题
A．criticallyB．approximatelyC．independentlyD．costly
A．critically
B．approximately
C．independently
D．costly
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