A-A+
(If) the experiment succeeds or fails it will
问题详情
(If) the experiment succeeds or fails, it will (provide us) with valuable (experience) which is essential to (improving) our future work.
A．If
B．provide us
C．experience
D．improving
参考答案
正确答案：A
解析：改为Whether。因为在从句中后面有个or，所以用Whether。
