2. 外语
  3. The scientist has made another wonderful discovery,______is of great importance to science.

The scientist has made another wonderful discovery,______is of great importance to science.

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问题 The scientist has made another wonderful discovery,______is of great importance to science.
选项 A、which I think
B、which I think it
C、of which I think
D、I think which
答案A
解析 which引导非限定性定语从句，I think为插入语。
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