.
---- 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
.
---- 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
D