25. ---- Ricky, why hasn’t Billy been with us these days?
---- Oh, he is _________for next month’s 400m race.
| A．standing out | B．taking up | C．backing out | D．working out |
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25. ---- Ricky, why hasn’t Billy been with us these days?
---- Oh, he is _________for next month’s 400m race.
| A．standing out | B．taking up | C．backing out | D．working out |
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