题干
Though we spent a lot, we think it _____ because we succeeded in the end.
A：worth
B：worth being spent
C：worthy of
D：worthwhile
答案(点此获取答案解析）
D
A：worth
B：worth being spent
C：worthy of
D：worthwhile
x+4=0的两根，若a，bÎ(-
)，则a+b=（ ）
