【題目】After the training, Bruce and Ian could operate the machines by ________. (them)

【答案】themselves

【解析】

句意：訓(xùn)練結(jié)束后，布魯斯和伊恩可以獨(dú)自操作機(jī)器。

根據(jù)固定搭配by oneself“獨(dú)自”可知，介詞by后接反身代詞。故填themselves。

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