2. 专升本
  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.

admin2020-04-26  16
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 根据语意，用not until(直到…才…)。直到我解释了，他才知道怎么用。
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