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 |