________we fail again, we will have to give up the plan.
A: Since
B: Whether
C: If
D: Till
A: Since
B: Whether
C: If
D: Till
举一反三
- __we fail again ，we will have to give up the plan.
- We won’t give up ___ we should fail ten times.
- They would rather try and fail than (give)_____ up the plan.
- ______ the weather is so bad, we have to delay our journey. A: efore B: since C: till D: Afte
- Because of a(short)（）of funds, we have to give up the project.