He hadn’t been at the factory for long __________________(他就把机器的拆卸和安装都学会了). befo

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问题 He hadn’t been at the factory for long __________________(他就把机器的拆卸和安装都学会了).

选项

答案 before he had learned how to dissemble and assemble the machines

解析此句主要考核 before引导时间状语从句的用法以及“拆卸和安装机器”的表达方式。

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Hehadn’tbeenatthefactoryforlong__________________(他就把机器的拆卸和安装都学会了).befo