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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