2. 外语
  3. We showldn’t do that dangerous experiment______the teacher is with us.

We showldn’t do that dangerous experiment______the teacher is with us.

admin2014-01-17  25
问题 We showldn’t do that dangerous experiment______the teacher is with us.
选项 A、if not
B、unless
C、if
D、as long as
答案B
解析
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