题干
— Would you like to do it at all?
— I'd love to, but the question is _____it is worth doing.
A：if
B：whether
C：when
D：that
答案(点此获取答案解析）
B
— Would you like to do it at all?
— I'd love to, but the question is _____it is worth doing.
A：if
B：whether
C：when
D：that
