They did the experiment _______ their chemistry teacher had instructed.

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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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专业英语四级

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