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题目内容 (请给出正确答案)
单选题
____
A

before

B

unless

C

until

D

because


参考答案

参考解析
解析:
before引导时间状语从句。unless引导条件状语从句。until引导时间状语从句。because引导原因状语从句,解释前面“engage”的原因。故D项为正确答案。
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