2. 外语
  3. John did his work_____his boss had instructed.

John did his work_____his boss had instructed.

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问题 John did his work_____his boss had instructed.
选项 A、though
B、until
C、when
D、as
答案D
解析 考查连词的含义与用法。本句中的instruct是及物动词，必须带宾语才能构成完整句，四个选项中只有as作为连词才可以充当宾语，故选D。
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