专四
A．as
B．until
C．when
D．though
【解析】连词的含义与用法。as作为连词可以引导方式状语从句，表示“按照，依照；正如；像”，如：I have changed my idea as you suggest．(我按照你的建议改变了主意。)As all his friends agree，he was warm hearted and generous．(正如他所有的朋友所认为的那样，他热心而慷慨。)其他三项也都是连词，until和when引导时间状语从句，though引导让步状语从句，但它们引导的从句都应该是完整句，而本句中的instruct是及物动词，必须带宾语才能构成完整句．因此B、C和D项不正确。
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