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The new staff didn’t know how to use the system _____ I explained it to him yesterday.

The new staff didn’t know how to use the system _____ I explained it to him yesterday.

题目解答

答案

until

解析

这个句子需要一个连词来连接两个从句。根据句子的意思，新员工直到昨天我向他解释了系统之后，才知道如何使用系统。因此，这里需要一个表示“直到”的连词，即“until”。

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