Question

You'd better give it up ______ it is too late, or you'll gel into trouble.

1. A.
   since
2. B.
   before
3. C.
   so that
4. D.
   once

Answer 1

B
before 引導(dǎo)時(shí)間狀語(yǔ)從句，本意是“在……之前”，此處應(yīng)理解為“以免”。