Question

【题目】You'll find it hard to get rid of the drug habit _______ you have it.

A. before

B. once

C. until

D. though

Answer 1

【答案】B

【解析】句意：你会发现一旦吸毒成瘾就很难戒掉。根据句意不是before“在……之前”，也不是until“直到”。