________ you fail in the exam, you will let him down.
A: Although
B: While
C: If
D: Until
A: Although
B: While
C: If
D: Until
举一反三
- You will surely fail in the exam（）you work hard. A: but B: if C: unless
- _____ you fail this exam, you can always re-take it next year.
- You will fail the exam ____ you work harder. A: ecause B: Although. C: Unless.
- The young man promised to his parents, “I would never_____ again.” A: let you out B: let you down C: let you in D: let you by
- If you let someone down, you ______ them.