I wonder if she us,but I think if she us we will be able to plete the task ahead of time.
A. helps;helps
B. will help;has helped
C. helps;will help
D. will help;helps
网友回答
A. helps;helps
(答案→)B. will help;has helped
C. helps;will help
D. will help;helps
解析:I wonder if中的if表示“是否”,从句中应该用一般将来时;I think if ...中的if引导条件状语从句,意为“如果”,从句中用一般时代替将来时。