John did his work_____his boss had instructed.A、thoughB、untilC、whenD、asD考查连词

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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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