You’ll find it hard to get rid of the drug habit       you have it.
A．before B．once C．until D．though
B
考查連詞，before 在什么之前，once 一旦，until 一旦，though 雖然，句意：你會發(fā)現(xiàn)出去吸毒的習慣很難一旦你染上。所以選B。
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