题目内容

______is known to us, he is the top student of our class.
A.ItB.AsC.ThisD.That
B
考查非限制性定语从句。此处as代替he is the top student of our class.句意:他是我们班里的优秀学生,这一点我们都知道。如果用A项句型It is known to us that-----.
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