2. 外语
  3. The professor can hardly find sufficient grounds ______ his argument in favor of the new theory.

The professor can hardly find sufficient grounds ______ his argument in favor of the new theory.

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问题 The professor can hardly find sufficient grounds ______ his argument in favor of the new theory.
选项 A、which to base on
B、on which to base
C、to base on which
D、which to be based on
答案B
解析 定语从句。这里实际指to base his argument on sufficient grounds。句中使用定语从句的形式，先行词为sufficient grounds，对应的关系代词应该为which或者that，该关系代词在从句中作介词 on的宾语，因此只能用which，不能用that。
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