They did the experiment______ their chemistry teacher had instructed.A、asB、thou

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问题 They did the experiment______ their chemistry teacher had instructed.

选项 A、as
B、though
C、until
D、when

答案 A

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”。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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