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

正确答案：C
答案解析：
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