跳球时,不论球拍向哪个方向,执行裁判都要成为追踪裁判()
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He fell asleep immediately last night; he must ________ (be) very tired.
A great number of small power stations ________ (set up) in their countysince liberation.
队员a5掷界外球时,球触及篮圈后弹回,被站在场内的a6接住并投中篮,裁判员判2分或3分有效()
Those who’d like to visit the exhibition ________ (sign) your names here.