The ship’s generator broke down, and the pumps had to be operated by hand.

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问题 The ship’s generator broke down, and the pumps had to be operated by hand.

选项 A、manually
B、artificially
C、automatically
D、synthetically

答案A

解析 by hand意为“用手”,manually意为“手工地”,意思相近。B. artificially“用人工制造的方式”;C.automatically“自动地”;D.synthetically“用人工制造的方式,用合成的方式”。
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