The new staff didn’t know how to ;use ;the system ;_________ ;I explained ;it to ;him yesterday. ( 章节：1 难度：2)_做题室

单项选择题The new staff didn’t know how to ;use ;the system ;_________ ;I explained ;it to ;him yesterday. ( 章节：1 难度：2): A、until; B、because; C、if; D、since

正确答案：A
答案解析：
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