2. 职称英语
  3. The new staff didn’t know how to use the system______I explained it to him yeste

The new staff didn’t know how to use the system______I explained it to him yeste

游客2023-09-26  49
问题 The new staff didn’t know how to use the system______I explained it to him yesterday.
选项 A、until
B、because
C、if
D、since
答案 A
解析 直到我昨天给这位新员工解释，他才知道如何使用这套系统。本题考查连词用法。until表示"在…以前"；because表示"因为"；if表示"如果"或"是否"；since可表示"自从"或"因为"。原句中前半句和后半句不存在因果和假设关系，运用not…until…结构，表示"直到…才"。参考例句：(1)I knew nothing until you told me．(一直到你告诉我，我才知道)。(2)She won’t leave here until you promise to help her．(直到你答应帮忙，她才会离开这儿)。
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