核心问题
There is not very much experimental data ____ a decision between the two possibilities. A. on which to base B. which is based C. to base on D. to be based 答案为 A。但这与关系代词 which 引导定语从句的用法不符。
词典解答
关系代词 which (whom) 除用于引导定语从句外, 还可以用于引导动词不定式, 即介词 + which (whom) + 不定式。此动词不定式结构一般充当名词的定语。例如:
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Yet now he had no pretext on which to prolong his stay. (Cronin) 现在他没有借口来延长他的逗留时间。
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We can't decide whom to invite. 我们不能决定邀请谁。
上题的意思是：
据以在这两个可能性之间做出抉择的实验数据还不是很多。