题干
.
---- Ricky, why hasn’t Billy been with us these days?
---- Oh, he is _________for next month’s 400m race.
---- Ricky, why hasn’t Billy been with us these days?
---- Oh, he is _________for next month’s 400m race.
A：standing out
B：taking u
C：backing out
D：working out
答案(点此获取答案解析）
D
