2. 外语
  3. 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.

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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
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